Youll probably need a whole new system to get good GFX out of it, and a hell of a lot more than £60. Wait for it to come out then see how things stack up, but im pretty confident youll need:
-New CPU (which will mean new motherboard)
-1GB RAM
-New GFX card
and to be honesst, £60 would buy you one of those, but id deffo spend £60 on RAM rather than GFX as with 512mb RAM you wouldnt fully utilise a better GFX card.