Just try someout,see how they perform on your system,try the omegas first then maybe the evolution series, if u look back abit in this forum there is a post regarding drivers for fx5900xt drivers
The 61.12s have always given me the best performance. 66.81s and 67.02s (both modded) seem nice too. -b[X]
Check these out I use these on my 5900xt and there great http://forums.guru3d.com/showthread.php?s=&threadid=116166
your rig is close to mine..or mine is close to yours...however you want to see it... I'm using the Extreme G 67.02's and i get GREAT IQ in all games, very good performance in Doom 3, Half Life 2, Call of Duty (both), and Counter Strike Source, and Need For Speed Underground 2... Very good performance in all games, with settings set at High in ALL games..and using 4x AA and 8x AF, except in Doom 3 (AA and AF not used) I just uninstalled FarCry seeing how I haven't played it in like 2 months...So I can't vouch for that.. I had 65.73's and they gave me GREAT performance also, very good driver ALL around...Except the 67.02's have better IQ..