witch would offer the best results in gaming on a budget 
2 X MSI HD 7750 2048MB GDDR3 PCI-Express Graphics Card
http://www.overclockers.co.uk/showproduct.php?prodid=GX-183-MS&groupid=701&catid=56&subcat=1699
so that's 2 low end cards in cross fire
or
1 x HIS HD 7770 GHz IceQ X 1024MB GDDR5 PCI-Express Graphics Card
http://www.overclockers.co.uk/showproduct.php?prodid=GX-069-HS&groupid=701&catid=56&subcat=1699
that one card at the same cost
i know the 7770 is the better card but at the same cost would 2 7750's be better, there would be 2 gpu's and at a minimum 2 X the amount of ram or 4 X if the second bank of ram is used.

2 X MSI HD 7750 2048MB GDDR3 PCI-Express Graphics Card
http://www.overclockers.co.uk/showproduct.php?prodid=GX-183-MS&groupid=701&catid=56&subcat=1699
so that's 2 low end cards in cross fire
or
1 x HIS HD 7770 GHz IceQ X 1024MB GDDR5 PCI-Express Graphics Card
http://www.overclockers.co.uk/showproduct.php?prodid=GX-069-HS&groupid=701&catid=56&subcat=1699
that one card at the same cost
i know the 7770 is the better card but at the same cost would 2 7750's be better, there would be 2 gpu's and at a minimum 2 X the amount of ram or 4 X if the second bank of ram is used.