Build your own in 10 min !
I've found it preferable to build my own linux 'distro' using a debian minimal install iso. Its pretty straightforward and infinitely customizable using both the Debian and Ubuntu reps, either in deb packages or with source files for own build of apps.
Check out my blog on building your own distro in 10 mins here:-
http://terminator3000debian.blogspot.com/
I prefer to keep it basic with just Fluxbox, a terminal and a few other bits and bobs to start, but you can substitute those for pretty much anything including Gnome, KDE, LXDE, and much much more from the vast Debian/Ubuntu resources.
The Debian minimal I've found also to be faster and more responsive than others, and I've tried quite a few.