I'd go with the 172 or 120 straight through. The heat picked up from the radiator will not be much and the air will help cool the pci cards and motherboard. You could then get rid of that lower 92 mm inlet fan. I don't know how many pci cards you have, but I stagger my cards to keep slots open in the rear of the case to allow air to escape. If all the slots are full, then I'd turn the lower 92 around to suck the hot air out. Let the upper 92 get cold air in to cool the chipset and the back of the video card.
Of course, this all depends on how strong that 172 or 120 is. I have a 120 x 38 mm AC fan that really pulls air with a steel rotor and blades. It has a lot of momentum and will cut a finger without slowing! It is also very quiet.
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