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u mean how hot the air coming out the back of the pc is? the exhaust fan? i you do mean that then its very hot...the airs pretty warm indeed that its blowing out

Is there a noticable difference between the PSU exhaust the motherboard exhaust and the GPU exhaust ?
Like : warm summer wind/car heater/blow dryer ?

gpu exhaust is the hottest

mobo exhaust medium heat....still hot but not as hot as gpu

psu isn't kicking out too much air really...and its probably the coolest

I'd say you're good. The exhausts point out that the lower you go the hotter it gets so I'd say you don't have a "hot case ambient" problem.
Check the top of panel of the case. Mine gets warm but not hot and I don't have a top exhaust fan mounted on my Stacker just the mesh mounting cage for a fan.

i don't have a top exhaust for mine either anymore....just a vent......i was playing a game for a hour last night and my cpu temp rose 2 47 which is actually ok really ain't it? and my gfx card was at 63

Those are good CPU temperatures yes (125W chips do produce alot of heat). The GPU is quite cool from what I know about the 8800GTX. Somehow I've never really worked with one. Everybody here was ignoring them (no wonder at 600+EUR).