£350 For a new GPU in the uk? Any suggestions?

So the title pretty much says it but yea, any fingers in the right direction would be greatly appreciated. I've had a look at the 780 or the 7970 but any other suggestions that could maybe save me money?

Cheers guys! 

MSI GTX 780 Twin Frozr Gaming £380 http://bit.ly/1bZOtca

MSI AMD R9 290 GAMING TWIN FROZR IV 4GB Pre Overclocked £330 http://bit.ly/1p2Mkkj