Best CPM program for 30 million impressions per month?

I work on (for simplicity’s sake, let’s say I own) a website that has 1.2 million impressions per day, and approximately 110,000 unique visitors per day. I’m looking for a reliable, well-paying CPM program. My other questions are:

What would be a good CPM to aim for? I’m looking at maybe a large banner ad at the top.
How big of a difference does a banner on the top make versus a banner on the bottom in terms of CPM?
How much money could these ads generate per day? Is multiplying impressions by CPM too simple?

I realize that I will probably get referred to other CPM threads, but I would like to get answers to the other questions, at least.
Thank you,
Cook

See original post by Cook Me Plox