We usually have 150-250 unique visitors day. Very highly targetted traffic because users find the website looking for web hosts.
Your banner could be on the top of all pages (except search and index, which they would be at the bottom, middle on index)! WITH Google Adsense, but GA will be taken a bit down and fit more the website, yours will be at the top. If you are interested in removing Google Adsense, it'll cost a bit more.
As a bonus, if you sign with us for more than 1 month, we will get you also get you a banner on http://www.free-phphosts.com
which receives around 50 visitors daily! A great spot to be if your web host offers PHP!
PM me or reply here with the price you offer. Any doubts, do not hesitate in posting.