Im trying to decide how to mount a radiator in my case before i buy it, it is an EXTREMELY tight fight and if i mount a 120.2 radiator up top then i will lose at least 1 pci slot, im only gona have a CPU and NB block in the loop and next year i plan to go quad core. Heres what i was thinking for either option...

Swiftech MCR-220 Radiator mounted to the top of the case or

ThermoChill PA120.1 mounted to the top or rear of the case

granted the dual 120 would probably cool better but how much of a difference is there with the thermochill single and the dual 120...