Bankroll Management

I finished second in an MTT last night so for the first time have a substantial amount of cash deposited with Party Poker.

How do you veterans manage your bankroll as far as where you hold it? Do you keep just a bare minimum with Party or whoever and pull the rest and keep it in a savings account or what?

I play $22 and $33 SNGs (20ish a day) and $22, $33, and occasionally bigger MTTs. What is a good (doesn't have to be ultra-safe) bankroll for these amounts?

Much thanks in advance for any help.