I dont think you need 100 buyins to play a level 30-50 is fine IMO as long as you dont mind moving down when you lose some. Personally if I ever get below 30 buyins I just move down levels till I have 40 buyins for the higher level and then try again. The main difference I have seen on the stars 55+5 copared to the 6+.50 is that there is less dumb play through the first few levels. And usually only like 2-3 players are terrible instead of 5-6. I havent played the 55's very long though so I am still getting used to them.