just spend 160£ and get a gtx 460 or a bit more on a 465
460 @ £160-185+ can get the 768MB version (192 bit), the 1GB version (256 bit) is better @ higher a res but will cost more £180-210+.
The 8800GT is a great card so is the 8800GTX and 460 . I get 30+ ground / 45+ space FPS @ 1680*1050 max setting, using my 8800GT (in my sig). I'm looking at getting a 460 (dual chip on one card would be nice), I got £300 set a side, for a new GFX upgrade to complete this rig.
In the end, Nvidia has taken its time, but offers an exceptional card with the GeForce 8800GT Compare Prices on GeForce 8800GT Video Cards. For about $230 it nearly displays the power of a GeForce 8800GTX (under 3%) twice as expensive, with the only downside being a slightly lower memory capacity (512 MB instead of 768 MB) and a bandwidth 10% lower than that of a GeForce 8800GTS. However, in games, the latter is usually outperformed by 30% without filters (using the 320 MB version) by the GeForce 8800GT and the GTX is only 12% higher. We have to say that the transition to the 65 nm process meant the arrival of more than just a couple of G92 on a wafer. By the way, this chip boasts 754 million transistors. It's small, consumes less than a GeForce 8800GTS 320 MB, and the 8800GT is also quite silent despite its single slot cooling system.