I'd get a case with bigger fans in the front 120mm intakes are pretty outdated, anything with 140mm+ for intakes.
Best air cooling case around £100 http://www.overclockers.co.uk/showproduct.php?prodid=CA-092-SV&groupid=2362&catid=1092 this or the corsair 550D would get my money.
Yet you recommend two cases with 120mm fans for intake![]()