I'm not sure which games you WANT to play. Ring games are vastly different from SnG's. (Sit 'n Go's.)
Do you know which you are better at? (Probably the ones you LIKE more.)
I know a general good rule for SnG's it to have a roll of 30-40x the buy in...so I would say if you're playing 1 table SnG's and starting w/ a $600 roll...play the 20's for now if you usually beat them...and play the 11's for now if the 20's are tough for ya. (Play the 20's or higher if you can replenish the $600 in case you lose it.)
If you're not talking about SnG's...let me know what you're looking into and I'll get you some better info.
