I'd start with the Case and Power Supply. You could probably get knock off $40-$50 between the two of them just by shopping around a little more.
Also, Tigerdirect has an HP 23" monitor on sale for $129 right now for Monday only. They also routinely will have sales on 21-22" monitors for $109.
After those savings my next step would be the motherboard then the CPU. Are you primarily using it for gaming? I think you'd be fine with an FX-6300 for $139. I know someone with a 4170 who doesn't get bottlenecked by his 7850 card. If you're using it for gaming, seriously, I know everyone wants the most power available, but it's more than enough to run everything at near top quality.
AMD's definition of cores is a little different than Intel's. Intel's draw less power and give off less heat.
I'd personally prefer a 8350 and even a 6000 series to most i3's, but there's some people that would disagree with me. But the i5s are the best bang for the buck overall if you want to run the highest detail on everything. i7's are overkill. But it depends on what you are using your computer for too.