Well after a while without posts I thought it about time that I add a couple in one day.
Having finally woken up this afternoon I have taken my case apart and fitted my new XP-90C heatsink. My CPU is idling at 33° and I think it will run slightly cooler than that when i sort out the airflow properly. I have yet to test it under load but the copper base of the heatsink mixed with the Arctic Silver thermal compound should provide a nice, cool operating enviroment for my PC.
I will keep you all posted with the news relating to the temperature once I have started to use it more