To the OP: Your temps still seem a tiny bit high. I also have an Antec P182 and I don't leave the fans on minimum if I've overclocked the CPU beyond 2.7 GHZ as I'd rather not have any of the cores (as measured by coretemp on Vista x64) go over 60 ish degrees even when stress tested.
I usually have it running at 3GHz and it'll run like that for weeks on end without needing a reboot.