Thanks guys, I'll leave it for 1066 MHz for now. I'm going to fiddle around with the timings though, my PC seems to like low latencies a lot.
As for the cooling, the 92mm leafblower on my CPU cooler blows towards the motherboard, so the RAM gets some air from that, and the 120mm fan on my side panel also cools it directly, so I don't think heat will be an issue.
Third rig: PC Express Invader. C2D E6400 2.13GHz, 4GB DDR2-800, 320GB HDD, Intel 945, Asus 9600GT 512MB, 550W PSU, W7 HP 64-bit.
Fourth Rig: Dell Optiplex 170L, P4 Prescott 2.8GHz, 512MB DDR266RAM, 80GB HDD, FX5200PCI 128MB, 250W PSU,XP Pro
Fifth rig (Laptop): Dell Inspiron 4000, 14.1", PIII 850MHz, 384MB RAM, 9.3GB, XP Pro. Now with passive cooling!
“I could make a better looking computer case with a bucket of Lincoln Logs.” -lemode