[maniacfromhell]

The more the better. 40 buy-ins is a pretty safe estimate though, but it's definitely not impossible for you to drop 40 buy-ins. It don't hurt to have more than you will probably need. Always keep your bankroll as fat as you can and you won't have to be worrying about it all that much. If you try to cut things too close, it can bring you lots of stress that you don't want to have to deal with.

Also I would not suggest that you change limits all at once. It might be best just to experiment at new limits at first and get your feet wet. You probably should not change limits then refuse to go back to the limit you are comfortable with. It can be a hard change to move up limits or at least was with me the first couple times I moved up the ladder.