The z60m is quite nice. It has a titanium lid ;)
I have a z60m and the smaller (IMO more practical) z60t.
The only issues are it is very heavy (breaks straps on my bag). I am also not a massive fan of the slightly rounded corners. Perhaps there for safety.
I do hope some hardware documentation leaks. It should have come with it in the first place! The (Atheros) wifi card also gives me issues on OpenBSD. Perhaps these docs will help clean up some quirks / hacks.