Full tilt is the best choice I believe. You get 27% rakeback if you sign up via pokerstrategy - make sure you do! If you sign up from their website you won't be able to get rakeback.. (though this isn't 100% true, I didn't and sent them an email basically saying rakeback or I'm going to pokerstars! haha)
Traffic is great and the blind structure is the best out there (imo).
Another good option would be William Hill. It's on the ipoker network and via pokerstrategy you get 5 StrategyPoints per every dollar raked. It's the best out there in terms of SP and it helps new players to unlock Silver, gold etc.
The bad thing is the bonus levels you can reach with william hill on their VIP system kinda suck for micro players(at a push I can get 12% rakeback) BUT PokerStrategy often have promotions especially for this room. So it helpsto keep an eye out for those.
The traffic on ipoker is very good on the $1 and $5 games.
For some reason the $2 games don't run as often...
enjoy `-`