For 200p you're not going to get much in the way of a CPU upgrade unless you go used. An i5 750 is still rather good for gaming today (I use one). Your graphics card isn't that great either though.
What games are you looking at playing? This will level the playing field because certain games are more CPU intensive, but the rest are all GPU.
Edit: So, if you were to upgrade here are your options.
Use current RAM.
Or buy used i5 (which makes no sense considering cost)
All in all, if you have a 6870, going with the first option would probably be your best. If you know how to overclock and have a decent cooler, getting the little i3 to 4.4 or 4.6GHz (easily doable) would suffice while having a card like a 760. I did that for a while when I fried my first i5 750. That was 3 years ago though.
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