What's the deal with fans getting placed below the PSU?

I've been looking at some PSU's for a new system I'm going to build, and I need a 850W+ PSU to support a dual GF8800gtx setup in the future, now I have to choose between two PSU's:

Tagan 900-U95 @ €303
Or:
Cooler Master Real Power Pro 850W @ €196

I don't like the idea of the fan beeing placed below the PSU, because it will blow the hot air ontop of my CPU. Also, i'm thinking of buying the Stacker 810, where the PSU is placed on the bottom of the case.
I imagine this will possibly result in a catastrophic event

Should I save €100 on a PSU that has the fan placed below the PSU or get the Tagan one instead?

I'm also going to overclock my proc with aircooling.

Those psu's in the pics are upside down i think. but normally a psu's fan on the bottom sucks the air out of the case through the psu and out the back of the psu.

Oh - and just one more thing - the fan on the bottom of the PSU does not blow air into the case - the air is forced out of the case through the back.

Just though a bit more repetition would be repetitive.

I've been looking around for some reviews about the CM RP 850W, there doesn't seem to be that many yet, but I've found this german review, (click in the menu to translate to engrish) it doesn't seem to be that bad of a PSU, I think I'll take this one as it saves me some cash.

Granted, I too think the Tagan would be better, but the CM should be good enough I think.