yet another bankroll post

[gomberg]

Lets say you are aggro but not too aggro. I used to keep 10 buy-ins for 1-2 and 2-4 and never had a problem. I moved that up to 15-20 for 3-6. Now at 5-10, what should it be. I don't really feel too comfortable under 20, so I'm thinking around 25 (this may just be for mental stability to play well - still getting used to the stakes). My biggest downswing in the game has been 6 buy-ins, and it sort of freaked me out. Granted, I'd say 1/2 of that loss was due to some bad play because I was playing when I shouldn't have been (too tired after work, etc.).

My poker bankroll is used only for poker and I never take money out (I have a good job at a trading firm) - so basically my goal is just to move up as fast as possible while beating the game.

What's the biggest downswing regular 5-10 players have had that you can remember? Thanks!