Stonehammer - Well, like everyone we like good GEO productive traffic that is nearly free.
Seriously though, a reasonable mixed geo, or good geo skimmed, or plug traffic seems to work for us. Popunders or direct ads I am not interested in.
Thanks for your appraisal of Ravo, will be in contact regarding the skimmed traffic.
Protraffic has my blood boiling, TH is quite good as well though so far.