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Yes they are all fine, but remember the new ATI cards (the 4750 in particular) could be within your budget, and apparently will beat the 8800 GT by a bit, they will be released in a few weeks.
4850 should be around £140ish, and is early results seem to show it 40% faster than an 8800GT. So if you can pick up an 8800GT for £100 they're about the same bang for buck.
http://www.nordichardware.com/news,7854.html
Does an ATI 4750 even exist? I've never heard of one.
Even if the 4850 is out of your range the prices of the 8800GT will drop a bit![]()