Ok, thanks. One more question. If I had $100 more, would it make more sense to get a $350 GPU instead of the $250 7850, or get the i5 3570K instead of the Phenom II?
I would say it really depends on several factors. Although I will say I agree with muffin, grab the 2500K. $10 dollars is 10 dollars and my opinion Ivy doesn't deserve to be paid a single penny more for than a Sandy.
Some of the factors it would depend on:
1. What games you're playing. If you're doing heavy intensive games a lot like Starcraft II and Skyrim, then go ahead and grab the 2500K and keep the 7850.
2. What resolutions. If you're playing on an old VGA monitor, honestly the 7850 is probably overkill. If you're got a nice 22 inch+ 1080p monitor and expect to play games in super high resolutions, then you're better off with the stronger GPU, maybe even step up to a 7870.