Bankroll requirements for PP STT's

[SNOWBALL138]

I'm trying to become a single table tourneyment specialist on Party poker. What do people think the bankroll requirements are for various STT levels? My assumption so far has been that for 10-1 STT's $100 is good, and for $20, 200 is good, etc. Is this enough to cover standard fluctuations?

I turned $50 into 450 on the low level STT's, but then I set my bankroll on fire at the $50 STT's and had to go back down to lower levels.

I'm the kind of guy that doesn't like to reload my account on party poker. I always prefer to have one way transactions (i.e. cashouts).