Ok, I got it set up and running. So, in short, here are the figures of the i7 920 @ 4322Mhz(1.3875v) and 3 x 480s stock clock with ek waterblocks on :

cpu idles at 43C, the graphic cards idle at 40C
During gaming (stalker cop benchmark and oblivion with 12xsli fsaa and 12xtrsaa) and vantage run at 1920x1080 at high settings, the cpu temps reach 73C, the max temp of graphic cards hit 63C.
The psu is about to jump out of the case at full load )
The temps are very dependant on the ambient temps... The idle temp for cpu may very well be 38C if I open the window for example. It is very hot in my room in winter...
I'll make a thread about my system with pics and all in details this weekend, I hope.