yea...well...that's only my opinion...but yes, people have had some compatiblity problems, and i'm sure that more than me think that way. I'd use what ever you have currently...so if you have XP home, use that...I've actually heard that XP home is better for games, but I don't know if it's true.
That motherboard is good. With that motherboard, the multiple PCIe slots means that you can run SLI and the PCIe 1x ports are for cards that that use PCIe. You shouldn't be looking at SLI becuase it too, has compatiblity problems, and you have to have deep pockets to buy 2 of the same graphics card. You'd be better off with 1 good graphics card rather than 2 bad graphics cards running SLI.
AMD Newcastle skt 754 3000+
Elitegroup 755-A2 ATX motherboard
512 DDR RAM
120 gig PATA Hard drive
128 mb AGP 8x ATI Radeon 9250
300 watt 12 volt psu
Antec SLK 1600 case