What sort of temps are you getting, and what is the noise level like?Exactly how I have just done mine, 3 at the bottom as intake, 3 at the top as exhaust, works really well.
Does 3 fans exhausting at the top mean that warm air is being blown directly onto your PSu?
I've recently purchased this case, 3 intakes at the bottom, 1 exhaust at the rear and then 3 exhausting at the top. 2 of the top 3 exhausts push through my 240mm radiator. What I've noticed which is interesting is that my average temperature when idle is much higher than in my old case, but peak temperatures under full load are a lot lower.