Grab the 260M, mate. It'll be leaps and bounds better than the 230M
EDIT:
that Asus laptop would be better than your PC :S Buy a better Pc and sell your existing one, then buy a laptop with the money you get back?

EDIT:
that Asus laptop would be better than your PC :S Buy a better Pc and sell your existing one, then buy a laptop with the money you get back?