[Solved] Motherboard Compatibility

I built a rig almost 3 years ago now that is pretty outdated by now. My first item to upgrade is my graphics card. As of now my rig is:

ASUS M2N-SLI Deluxe AM2 NVIDIA nForce 570 SLI MCP ATX AMD Motherboard
AMD Athlon 64 X2 6000+ 3.0GHZ
Zotac 8800 GT 512mb
4gb DDR2 Ram
23" Monitor (1680x1050)

Eventually I'm going to upgrade the mb, cpu, and ram to i7/DDR3, but first I'm going after the graphics card. I'm looking to spend about $200 or less, and think I'm going with the 4890 over a GTX260. (roughly same price, but the 4890 looks like it tests better in the kind of games I like, like Fallout, Dragon Age, Borderlands)

I've been with NVidia forever, so I'm really not sure about ATI cards. Specifically, is my current motherboard compatible with an ATI card? I don't plan on crossfire, at least until I upgrade to i7, but will one ATI card run properly on my MB? (for reference: http://tinyurl.com/2v52yf)

Any help on the compatibility would be greatly appreciated, and also if you have any input on what card to go with, they'd be great too.

Thanks.

ive had you mb, just a little heads up, ati cards will work, but you will have probs with booting update the bios if you havent already before you put an ati card in, the mb would frezze at post, after i updated it booted fine, (i had to flash the old way) hope this helps

4890 = an O/C 4870. so not much headroom for OCing

GTX 260 216 has masses of head room for OCing.

take GTX260