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Finally what kind of revenue can you assume to make with say 1,000,000 impressions a month?
At 1M impressions per month, many of the banner rotation scripts fall apart (been there, done that), so I'd recommend Advertpro. [advertpro.com] I use CentralAd, but their support has apparently died, so I cannot recommend it.
While you are building the traffic, a good option would be to sign up with CJ, clickxchange, or other affiliate networks that offer their own rotation capabilities. You can invest in your own commercial rotation software later.