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lol, there is only room for 1 fan on the back im afraid which is an exhaust atm, but will be changing it to intake for the h50, thats where i should have purchased the 1200 with 2 fans on the back! gutted! the only thing is, my rear exhaust (which i will use as intake) is exhausting a lot more air than the big fan on the top, cause for concern when turning it around???
I have the original Antec 900, so it's pretty much the same as the 902. I just turned the 120mm fan around and stuck the rad on top (well I actually used the corsair fan but same difference).
Before installing the H50, I definitely noticed that more air came out of the 120mm than the 200mm. I think this is something to do with static pressure; because the 120mm is smaller and faster it has a naturally high static pressure despite having similar airflow, so the "path of least resistance" for exhaust was through the 120mm. This is just guesswork on my part, and I don't have the manual here with the pressure/rpm/cfm figures either.
Either way, with my H50 installed as you described, there is a lot more air coming out of the top 200mm fan. With the competition gone, the "big boy" has no problem taking over as main exhaust, and my airflow is just as good as it was before - motherboard temps have not been effected by the change at all.
CPU temps are awesome though, as I've posted somewhere around here before. Getting a max of 24 degrees under load from a stock X3 720.