its 155 pounds here in the uk (i live here too) for the 6600 gt but im not sure if its agp coz the only one i've seen is pci-express. i'd wait to be honest tho coz half life 2 will probably run ok on your card at the mo, it doesn't need a gr8 card  and if you wait and get a 6800 u'll notice the difference more
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Sapphire X800XL 256mb
Athlon 64 3500+
2gb 3200 ddr ram
120gb hd 8mb
19" Dell M993s
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