Re: I'm feeling old!
I had the DX100 as well. The four operator version of the DX7 which was six operator iirc. I programmed that thing black and blue. Pretty difficult programming structure, but I had nothing else. Most of the time it was just a case of 'change that parameter see what it does'.
Now I have the excellent and far superior version of it - the FM7 by Native Instruments. They don't sell it anymore, but they do an updated versio of it called the FM8. Lots of people like it but I wouldn't part with my FM7 for anything. They copied the front panel of the DX7 and for some reason totally changed it to something god awful with the FM8. I think there might have been some kind of 'cease and desist' from Yamaha. The FM7 actually sounds warm. Experts say that strictly speaking the DX7 wasn't true FM - Frequency Modulation, but rather Phase Modulation. Whatever.
I have some real beasts that do FM in VST form now. Blue II by Rob Papen is a classic. Also Octopus by LinPlug is another. Sytrus by Image-Line. Plus a few more.
Here is a very rare and never released version of the DX7 in VST form that can import the thousands of sysex patches on the net - http://black.winny.free.fr/MAO/VX7/
It's six operator and can import SY77 as well. Not sure how good it is, but others say it's great.
This one is pretty good too apparently - http://www.kvraudio.com/product/dexed-by-digital-suburban
While you're there check out the AlgoMusic synths, they are pretty amazing as well. All free now.
The reverb you are referring to is the Alesis. I had one of them too. It was the only affordable digital reverb at the time and had a narrow band of usage without it going mettalic on you. Still, a very very nice reverb. I wish I still had it, but I'm spoilt in that dept. as well.
For 30 quid you can get an excellent emulation of an old Lexicon from Audio Damage, called ADverb.
But the most versatile and mind blowing would be either the Valhalla Vintage Verb or Valhalla Room. VVV is an emulation of old Classic Lexicons. While Room is more an emulation of actual room space. It's all explained on their website: https://valhalladsp.com/
If you like super long and lush reverbs, then check out their Shimmer. It's simply gorgeous. They even give away a free Delay FX there which is also stormingly excellent. They all cost about 30 quid. Can't remember. The valhalla reverbs are used by people that own the actual 5000 quid units. They are state of the art. Nothing matches them for the price. I won't use the term 'industry standard', coz I hate it.
If you can't run to that and want some free ones, I highly reccomend either epicVerb by Bootsy - http://www.vstcafe.com/2009/03/epicverb-is-reverb-device-that-aims-at.html
or any of the TAL reverbs/delays - http://kunz.corrupt.ch/products/tal-reverb
Simply awesome for free, but perhaps you might like to donate even a beer to say thanks. They do some excellent free synths too based around rough Roland emulations.
Talking of Roland emulations, there's a pretty good emulation of the TB-303 called Venom, kicking around somewhere as well. Free too. Why don't you couple that with probably the best free emulation of the TR-808 - Tromine GT http://marvinpavilion.ojaru.jp/en/sound/vst.html
There you will find an emu of the TR-909, the CR-78 and even a Simmonds kit. Think there is a Casio Phase Modulation synth there too. Have a look.
If you are really crazy for an 808 and don't want to splash any cash, then check out the TS-808 http://tactilesounds.blogspot.co.uk/p/tactile-synthesizers.html
and the VR-08 http://www.vst4free.com/free_vst.php?id=1701
Altogether those are the three best emus you will find of that classic drum machine. People that own the real thing swear by them, though they aren't totally perfect. But neither are the paid for versions. I'm a big fan of D-16 and I have their Drumazon which is a 909 emu. It's pretty spot on but costs about 80 quid.
So for no cost at all you can get a couple of world class reverbs that blow away your old Microverb or whatever it was called. And a couple of excellent emulations of the DX7 with thousands and thousands of patches to play about with.
If you don't have a DAW already to plug them into, then just buy any old keyboard controller - they usually come with a copy of Ableton Lite or wtf it's called. It's fully functioning if crippled, but it gives you the ability to save and work out how the program works. I think you get 8 audio tracks and the use of 3 VSTs or something. It changes as the program evolves, but you get the picture. Also check out Podium Free - that is about the most powerful and functional and non-crippled DAW you can get these days. I think it might not take advantage of multi-core.
That and a copy of Computer Music mag for a fiver and you have a state of the art digital studio running in your (hopefully recent) computer. More cores the better as audio software really takes advantage of concurrent programming. Not sure how it's going to work out when we get past Octo-Core, what with scheduling and whatnot, but that's another argument for another day. For now. You have the equivalent of a studio costing hundreds of thousands of pounds, just a decade or two ago, for less than the cost of a couple of pints. One of the great things about being alive now in the digital age.
If you don't want to buy a keyboard to get Ableton Lite, just put up a nice polite post at the market place forum on KVR asking if anyone has a spare license, and within a day or two some kind soul will just email you their serial and you have it for nothing! I've given away a good few copies of that to nice polite people there. Thanks was all I asked. If you are going to get a controller though, like I said a few posts up, check out the Novation LaunchKey, even the small cheap version is excellent and they all come with a copy of V-Station and Bass Station II - both awesome synths. I bought those before and gave away my old copies to other nice people along the way.