heath1 :
What CPU should i go for at least?
None in the FM2 socket unfortunately. You will want to replace both the CPU and motherboard. If you want to stick with the AMD route (cheaper), then perhaps a FX-6300 or FX-8320 CPU. For the motherboard, I suggest an Asus M5A99X EVO R2.0. Together that is about $220 - $270 extra.
The Intel route is more expensive. CPU would be an i5-4690K ($220) and a perhaps a Gigabyte GA-Z97X-Gaming 3 for the motherboard ($129). You can get a cheaper CPU or motherboard, but it won't make a big cut in the budget. You can probably save $30 without losing too much.