You should have been more careful, even with a corrupted display, you could have killed X and fixed things from the command line, atleast changed the X.org conf file back to the generic driver. I know ubuntu defaults to 24bit colour depth, this may have caused the problem. You installed gentoo, so clearly the technical side of linux isn't a problem for you, it just seems like all that distro hopping was a waste for a savvy linux user.
I first tried linux back in the mandrake 8.2 days, (all craziness with compiling KDE 3 and rpms, fglrx, getting DRI working) and ubuntu now is so amazingly polished comparatively! The *perfect* general computing OS. Gnome fits so perfectly with it, I doubt you even need KDE to help with the move from windows to linux!
I really like using OS X, above the other two, but it ain't free
.
edit: actually, I *first* used linux in the form of pclinux (i think thats what it was called), the ambitious distro built to live on a normal windows drive, that I had gotten off a pcformat magazine cover disc. Back in 1999 I didn't even know how lucky I was to have installed and uninstalled it with zero problems, I just kinda assumed it would work
. I remember I waited like 3 hours for it to install, played the space fighting game that came with KDE2, and got bored with it
. Those were the days, ahhhhh.