Will my motherboard/computer be able to handle nvidia gtx 260

Would an ATI be better? Will it comply with my rig?

The GTX260 is a bit over 10 1/2 inches long (270mm) You'll have to measure your case yourself to see if it will fit and not cover SATA sockets or clear your hard drive. I am a little concerned about your power supply since Apevia has a pretty bad reputation. A number of cards would be a big upgrade for your system. Here's a handy hierarchy chart to show their relative power.
http://www.tomshardware.com/reviews/best-graphics-card,...
As you can see the HD4850 is one tier below the GTX260 and running about $150-$170 after rebate.
Your motherboard has a PCIex16 socket and it will work with any PCIex16 1.0 or 2.0 graphic card

I would highly recommend changing your PSU.
APEVA PSU's are among the worst out there.
I would recommend a quality 500w+ PSU from a company like Corsair, PCP&C, Enermax, Silverstone or the Antec Earthwatts line.

Your Motherboard can fit it just fine.
There is a good chance that your PATA connector will be blocked, though.
I doubt you will be able to upgrade your RAM without removing the GPU also.

Full info on your Mb.
You will have to measure your case to see if it will fit.
Worst case, take a dremmel to the Hd cage and make some room.

The GTX 260 is not a bad card but you can do better.
ATI's 4870 will match to beat bye about 15% the GTX 260 and costs about the same.
ATI's 4850 is about 15% slower to matching the performance for about $100 less and is the sweet spot for price/performance right now.
The 9800GX2 is also still a viable option.
With rebates, it costs about the same as a 4870 or GTX 260 and performs a little better than a GTX 280.

Depending on the game title, the GTX 260 and 4870 will trade off wins. Overall, the GTX 260 is only slightly faster with AA with a couple FPS slower overall than 4870 without any AA. All resolutions up to 25x16. Tom's Hardware did a review a while back on it, they tested a load of games. The performance difference are in the single digits and not 15% as outlw666 says. It all depends on the games you'll be playing, pick the card that performs better. For example.. GRID plays faster on ATI 4870 cards while CoH runs faster on Nvidia GTX 260 cards. Overall, their performance is identical except for the few games where performance is significantly different.

there both good cards go for the one that is cheaper.

Actually, it performs up to 27.7% faster in Bioshock @ 1680x1050 according to Anandtech's review.
118.9 FPS for the 4870 and 93.1 FPS for the GTX 280.
(118.9*100)/93.1 = 127.71 or 27.7% higher performance.
The performance gap closes as the resolution raises but the 4870 still maintains a healthy lead in most benchmarks.




BTW, the 4K series fixed the lackluster AA performance of the 3K series.
There is now only minimal performance drop up to 8x AA at which point it outperforms the GTX 280 in nearly all games.

I really appreciate the help guys and any other advice would be greatly appreciated in the future.