In the P182 (& Silverstone TJ-09, Coolermaster C690; Cosmos), you can face the PSU downwards, so the fan is mounted at the bottom, thus expelling heat straight out of the case. Plus the Antec has a compartmentalised design to stop PSU heat from reaching the motherboard, etc.
aii, I will be doing that, atm got a really bad DELL case but Overclocking pretty well on everything else,Good luck with it. Post some build pic's when you've got it. They are well laid out cases and look good; especially for the price.
The fan you're talking about is an intake, is it not? In which case, it will bring cool air from outside the case, cooling the PSU and expelling it out the rear, thus having no effect whatsoever on case temps.
Yeah, I meant that it'd suck the air upwards straight into the PSU, then expel it immediately through the back of the PSU, thus having no impact on case components. Basically what you just wrote.