Bankroll requirements

[Carnite]

Ok, so I'm fairly new to 2+2, been floating around a few other forums for a while though, but of course they all only prattle on about Texas Hold Em. Anyway, I know it's a regular topic of discussion on other threads but I can't find it on this one -

What sort of bankroll should you have for playing PLO?

Let's assume 100BB Buy-ins and talk in terms of number of buy-ins required.

I typically play .10-.25 ($25 max) or .25-.50 ($50 max) and do the former reasonably well on a $200 bankroll (sometimes < $100, but that's when things get really risky) and if things are going well I can still handle a few .25-.50 games on $200. That's 4 buy-ins at a possible (not really where we want to be) and quite comfortable with 8 buy-ins.

I've been clever enough to take a run at a larger game with 2 buy-ins (heh, ok, c'mon, let me hear it), But what should I really be looking at before I consider moving up to say the .50-1 or 1-2?