rolypolyman, NO!
New cards are coming in March, and could well have 1 and a half times the performance due to 1200 shaders, What's more 40nm will enable higher clocks - maybe even 2* the performance! AMD produced 40nm cards in early December, so they'll be finetuning them now (which, given the amazing yields AMD have, will result in even more boosted clocks!)- we might even be able to expect a february launch!
The benefits over a 9800GTX are very small, and not worth anywhere near £160. you'll lose PhysX, which is being supported in far more games, and CUDA - think of folding at home!. Your E6750 will bottleneck it unless you overclock to about 4Ghz...
...therefore getting one of the currently still unknown next generation cards would be of rather less use than you suggest.