I have promoted PartyPoker for a year now and rate them because the cash bonuses pay for player acquisition costs. I do well at Pacific as well.
Noble looks promising once you have players. Those would be my top 3.
I agree with Ellen – poker rakes build up over time and it depends on the level of play which, in turn, is a function of the underlying traffic quality. I didnt look at my PP stats for 3 months and was wowed by the build up of MGR.
Just a cautionary note related to traffic quality. This month I got excited and bought lots of cheap traffic which lead to high downloads but atrocious conversions:
Noble 455 downloads 15 players (3.3%).
Paradise 1431 downloads 1 player (0.1%).
I dont think I will be getting as excited next month about cheap traffic…