Right now I have an AMD 3200+ and I was wondering if I should upgrade to the 3500+ venice core
You won't notice much of a difference, if at all, from a 3200 to a 3500.
Save your money.
Btw, your sig says your "current build" is spec'd much higher.
Is that the system you are going to build?
Christian has got a thing of posting in threads from 2006.