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Well thats 280 cf. I would go ahead and get a 4" 178CFM (High Output)inline exhaust fan. You can find them at a resonable price. Of course they say the exhaust only needs to pull in the total CF of your grow area in 5 minutes, but I think 178 is fine, and it certainly won't hurt the airflow or heat. I say 4" because it is a standard, and inline because they are not near as loud as some other types (squirel cage).
Me and you have already discussed lighting, and since I only use a 125W CFL in my 72CF closet (jealous of that CF ), others should weigh in.
I still think 2 400w HPS are better than 1 1000w HPS for that kind of space.