Hi got bored and did not want to fork out the cash for a 939 system, so i went and got a 754..
AMD64 2800+ 1.8Ghz CG stepping (Zalmans 7000cu HSF)
ABIT KV8 Pro rev1.1 board with a working AGP/PCI lock
2 x 512MB Corsair 3200c2Pro ram (went over board here I think

)
XpertVision 9800se vid
80GB Maxtor HDD (IDE) 7200rpm 2mb cache
120 Seagate HDD (Sata) 7200 8mb cache
Antec 350wat smart PSU
etc etc etc
This is what I got it all to run at.
AMD64 2800+ @ 2.4Ghz (9x267FSB -HTT600 @800+) could not get the system stable at 800 or 1Ghz stock). When overclocked the 600HTT runs at 800+ (1.65volts)
RAM is at 218mhz (436mhz) Cas2.5 3 3 6, 2.70 volts
XpertVision 9800se Softmodded to pro Core 412/ Mem 351.
So in short the 2800+ is a very good overclocker for me..
3DMark03 - 6169 (Could be better)
Aquamark3 - 45,589
Lets put it this way.. it is faster than my P42.4C@3.0Ghz and the same setup as above. Not by much but it is..
CPU $231 Australian (AUS), so about $160 to $170US
Board $156AUS
RAM $360AUS
So if you dont need new ram then it is a cheap upgrade..