I'd say go for an i5 2500k and MSI P67A-GD53 motherboard.
http://www.overclockers.co.uk/showproduct.php?prodid=MB-170-MS&groupid=701&catid=5&subcat=1906
http://www.overclockers.co.uk/showproduct.php?prodid=CP-360-IN
http://www.anandtech.com/bench/Product/108?vs=288 - i5 2500k vs your current i7. It can also overclock better than the i7. Well worth it in my opinion.
http://www.overclockers.co.uk/showproduct.php?prodid=MB-170-MS&groupid=701&catid=5&subcat=1906
http://www.overclockers.co.uk/showproduct.php?prodid=CP-360-IN
http://www.anandtech.com/bench/Product/108?vs=288 - i5 2500k vs your current i7. It can also overclock better than the i7. Well worth it in my opinion.
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