Here's my update. I went ahead and got this for the PC instead of the PS3. I'm ordering a new Vid card soon, but I was happy to see my system can run the campaign mode well with my old card.
My system:
Q6600 Quad core 2.4 ghz
ATI 4670 512 megs
4 gigs of RAM
Running 1400x900 on mostly medium quality and couple settings on low, AA is off.
I've just now passed the jet mission in the campaign mode and my system has kept up well.
I'll be ordering something like a 6870 for around $150 and may OC my CPU if needed.
I'm enjoying the early campaign fairly well, it's not all that difficult, but the story is compelling and the visuals/cinematics, imo, are very impressive. We all know the meat of this game is multiplayer and I'll get into that tomorrow.
Btw, any PC players hit me up sometime, my Origin ID is DA-Bucks (shocking!)