[Albert Moulton]

If you are playing a 1/2 200NL game with a $400 max buy-in, then I would recommend bringing at least $1000 in cash, and buy-in for $200 (100 big blinds). Keep your stack at 100 big blinds while you play. When/if you start winning, you'll get deeper. When/if you get below 100 big blinds, take some extra chips out of your pocket and "top off" between hands back up to 100 big blinds.