I'm in a similar situation, but since I'll be using it for 3D art too I decided I might as well go opteron.
I know they have a higher L2chache, and they OC better, but that's it.
I'm wondering if getting a opty 165 is fine, or if you see major boosts with a 170. (sorry to derail slightly.)
In The Mail!!!!- Athlon 64 3500 @Stock/Abit K9N SLi sAM2/2GB G.Skill DDR2 800 @Stock /XFX G7900GT XXX 520/1500Mhz/74GB Raptor w/ 16mbcache/300GB 16mbcache SATA HD/NEC DVD-RAM Burner/OCZ ModStream 520watt psu/ThermalTake Armor Jr./Logitech EX110 mouse/keyboard