Other than Pokerstars or Full Tilt, I love Crazy Poker. They're on the Prima (Microgaming) network, so there's really no shortage of ring games, and they have some great tournaments as well. Crazy Poker is part of the Vegas Partner Lounge group. Their "Crazy" casino is Crazy Vegas Casino.
If you're REALLY a low roller, they even have $.09+$.01 SnG's! (single table tournaments)
I've cashed out a few times from their poker room and was paid via QT in under 48 hours each time. Their customer service is top notch and if you jump on live chat, they will flush (so you can't reverse it) your withdrawal request instantly, no questions asked.