I have a current site, that is gaining a reputation for been a good reference site, which is good because I'm getting lots of reapt visitors and they tend to browse 10-20 pages as they read. However these guys don't click ads, which doesn't exactly sureprise me, so I'm looking for a good CPM network. Ideally with similar banner sizes to adsense so I can replace a couple of banners and hopefully increase my income. I'd rather keep the "quality look" for the site so would prefer not to have popunders, or inline links etc. Can anybody tell me the best networks at the moment.