Thanks for all the replies, really appreciate it.
I know this shouldn't really be asked here, but if you had a overclocked desktop (it's a Q6600 at 3.31ghz, nVidia 9800GX2 and a few terabytes of disk space, 4GB of DDR2 RAM) would it be worth running the 32 or 64 bit version?
I'd usually be getting the 64bit version because of the RAM capabilities of the previous 32bit models. Would it still be worth getting the 64bit version incase i decided to upgrade my ram to a DDR3 set above 4gb?