The specs are acually better with the 5700.
The only thing I don't care for with any ATI card is it's a pain to update the drivers and software compaired to the Nvidia cards.
Personally I would stay with the 5700.
I bought Dell XPS 8100 desktop that came with the ATI Radeon HD 5700 Series video card. I had some problems updating a BIOS on that video card after couple failures. Dell tech support sent me a replacement GeForce GT 240 card from nVidia. In the meantime my friend helped me to update the BIOS on the ATI card and now it seems to work just fine. So now I have dilemma which card to keep. Any suggestions?