Nvidia 260 vs 4870x2

I have been using my 260 for awhile, but a friend just replaced his 4870x2 and gave it to me but im a little reluctant to use it. I checked out the benchmarks and its not a huge improvement plus ive heard issues with the 4870x2 that may make it not worth the small improvement. I use 2x22 inch monitors at 1680x1050. I got an intel e6750 dual core 2.66ghz processor overclocked to 3.2ghz with 4 gigs of ram running vista 32bit and windows 7 64 bit beta. What do u guys think i should do? I also heard that the 2 GPUs in the 4870x2 arent able to communicate with each other yet? anyone know about that? and if its true does that mean it could potentially get a lot better than it is now? and also will that be any time soon? thx!

edit: i play world of warcraft windowed maximized mainly as well as other FPS games and mmos

well if you want reliability get the gtx 260 since your playing wow....and you can get a second later on and two 260's would kill a 4870x2 in anything