re:
ive got a barton 2500+ OCed to 2800+ and it runs at 49° C (with the stock fan) after playing doom 3 for a couple of hours... so i dunno if thats normal but everyone tells me its good ;)
.....
keep the sub low.. you wanna feel it too ;-) and put the speakers about ear level if possible... equidistantly spaced... sounds best as far as im concerned...