My 7800 GTX will run 3Dmark05 at 8100 consistently with a +3500 running at factory settings (no OC). All of my games run maxed out with no problems.
I like ATI and Nvidia cards and have run both for years.
I, for one, don't really care who calls themselves "King", I just want my stuff to look good.
I would truely like to upgrade to an FX57 but the wifey is wanting a new car so that upgrade is on hold.
You will never convince a diehard brand backer that the other brand is better. There is always some arguement to prove one person or the other wrong.
Most comments and arguements that I have read are made by people that do not own the equipment but read a report somewhere.
SLI works absolutely great as I am sure Cross Fire will. I really believe it gets down to personal choice on the video cards as it does the processors.
My main concern with crossfire and their cable is with running multi-monitors. I run 4 monitors and am not sure I can do that with the crossfire cable in place.