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For £85 if you look around you can get a 128 Mb GeForce FX 5600.
But if you can stretch to £109 you can get the much better 128 Mb ATI Radeon 9600 Pro. Obviously these prices vary, but that's what they were in a local PC shop.
£50ish would get you either a 128Mb GeForce FX 5200 or a 128 Mb Radeon 9200. But neither of them are nearly as powerful as the 5600 or 9600s.