Linux Mint, Ubuntu and PCLinuxOS were the ones I tried. Not impressed with any of them. I decided to reformat the spare drive and put Windows XP on it instead.
Goback to Mint and use KDE.. I had NO problems with 3 monotors (remember to choose the nVid drivers instead of the installed).. You will have full control of your PC, but, remember, you will have to know HOW to control ;^)