Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
Says it all in the title, if i sell my XFX GTX285 and invest some of my money into getting a GTX470 would it be worth it?
Do you find your 285 struggling? That's thee question.
Buy when you need to.