I play mainly at Ultimate Bet, but also play at Full Tilt. Both have great free rolls, but the trophy goes to Ultimate Bet with no less than a $50 free roll every 3 hrs, and even more tourney dollar free rolls. These all help build a roll. ( If you have 5 hrs to spare lol ) Hey, they're free!
Ultimate bet also has $.1 / $.2 cent games on up. They also have a lot of Tourney's starting at $1 / $2, and a 5K guaranteed $1 ReBuy tourney every night at 9:00 EST
Having played the mciro games, I find it easier to win the $.50 / $1.00 sit n go's. If i'm on my game, I can place in the money often, and Ultimate bet has these as well. Overall, I think this is the least expensive place to play with the most options for a smaller bankroll. Good Luck