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.
http://www.overclockers.co.uk/showproduct.php?prodid=GX-194-SP&groupid=701&catid=56&subcat=1274
Not sure when they come back in stock though.
club 3d passive 5750 would be an upgrade to that, would do some modern gaming too.
Around £120.
Its going to be over twice as fast as the 4670 easy.
I wont be as twice as fast but it should be a decent upgrade.