Originally Posted by Indigo
Chuck the AMD, get an Intel i5-3570K and a decent LGA 1155 motherboard. Keep the RAM, drop in a 650 watt PSU and grab a Radeon HD 7950 or 7970, move to a 256GB SSD for your boot drive, keep the other two drives for storage.
That's what I'd do if money were no object at least.
You should at least update to the i5 platform. They run circles around the Phenom II's these days. You could easily give your existing setup here a shot in the arm by dropping the AMD.
Yes, that would be ideal if the OP didn't count money. I think it is a safe assumption that he won't be able to afford all that. OP, if you're unable to afford all of that above then I suggest upgrading your graphics card to a Radeon HD 6700 Series. If you can of course. You may want to get a new PSU in the process, perhaps 650 watts.