Try this:
AM2 3200+
eVGA 7600GT
1GB (2 x 512MB) Corsair Value Select DDR2-667 or Corsair XMS DDR2-800 if you can afford
Asus M2N-E
Antec SmartPower 500W Power Supply
160GB SeaGate Barracuda Hard drive or something else
I'm not sure about the price but it should be around $600 I think. Heh, I've recommended to wait for Intel Conroe to enough people, for now I'll just customize AM2 systems to people unless they state that they prefer Conroe. Oh and by the way, after July 24th, you might wanna upgrade your CPU to a dual-core since prices will drop.