It will run on both those motherboards. The 8800 GTX is very similar, beats 4850 in some games and loses to it in others. The Ultra is much faster than the 4850 though, but you pay more. I suggest a 9800 GTX+which offers 10% more performance than a 4850 for $30 more or 10 pounds more. You'll have to pre-order though, set to come out next week.
I would take the 4850 HD because it is fairly cheap and offers very good performance. You will be able to run all games on high/maximum settings up to a certain resolution. You might need a cooler though, because under load, the card can reach temperatures of 85C. Not dangerous, but any higher and it will be.
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