Have to say, I think since I've switched from a nVidia card to my radeon, I've not looked back at all. The bang for buck value is great and the suppot in the way of drivers etc (which used to be fairly poor) isnt that shabby anymore.
I've got a x850 crossfire.
I could pick up a second x850 for about
£80 and that will be more than enough to run anything thats thrown at it, and still cheaper than stuff you're looking at
But given the choice, I'd go for RD's reccomendation. Its an awesome card. Well worth it.