Ubuntu!

Originally Posted by SeanGAR

I've always found PCLOS to be much faster than X/K/Ubuntu. You can choose KDE/XFCE/Gnome as the windows manager with PCLOS pretty easily. Mint and Mepis are also excellent distros to try. I'm running PCLOS 2009 on an IBM X20 PIII 650 with 386MB RAM no problems.

I'm on Mepis now. I migrated from SuSE. I like any debian linux better than the RPM based ones. Ubuntu based debians are a little harder to keep bleeding edge upgraded than raw debian. I've messed around with Solaris, SCO, IRIX, HPUX, and different *BSDs and I like what I've got now. But that said, I have to agree with the above comment by rennD.