You need to define your expectations better.
No system will insure you win a couple of hundred dollars every session, but what do you consider a couple hundred? Lets assume you mean three hundred after four hours of play, so you want to win $75 an hour on average.
Depending on the game conditions, it's not hard with the proper skill and bankroll. In the long run, a decent counter should win around one unit an hour, if not more.
So $75 an hour average win means a $75 average bet, which calls for a BR of around $30,000. How much of a spread you need depends on the game itself.
Just be prepred for a roller coaster ride where you may drop thousands of dollars a session for multiple sessions during the downswings.