Nate, check the bonus offers with a fine tooth comb - Carribean Poker for instance has 100% bonus for $50 deposit - you have to play x amount of raked hands BUT the rake needs to be over a $1, AND you need to actively participate in hand. To produce a rake of $1, you need to play $2/4 minimum, which is too high a level for $50 bankroll (you can bet $40 on a single hand). If you try too clear this bonus, two things could happen - you'll lose all your money, or you'll clear it, but pay vastly more than $50 in rake, so who wins both times?!
Some bonuses are much better. Bet365
has promotion this month of $10 for 50 raked hands - there's no minimum rake and you don't have to participate in hand. I played here for an hour, and the whole table was just trying to churn bonus, folding everything (and leaving table when BB came round again). I'd rather stick forks in my eyes than play there long enough to clear max $100.