^Overclockers must have dropped that one last night/this morning...Looks like the recent Nvidia price fight has spread to become a full blown war.
@ Heskey: The 8800 is an old card, what about the rest of the system-including monitor resolution?
Have a look at the chart at the end of this article:
http://www.tomshardware.co.uk/gaming-graphics-card-review,review-32740.html use it to check out the relative performance of any card you have in mind.
With prices changing so quickly here in the UK all I will suggest is that you keep a keen eye open for cards in your price bracket-just be aware that cards like the HD7950 may need a better PSU, it will be very unwise to run such a powerful card off molex/PCI-E converter leads.
A few UK places to gawp: Dabs, Overclockers, Aria, Scan, Ebuyer, Pixmania, Novatech, CCL and the ever popular Amazon.