For limit HE I reckon sit down with 30 big bets as a buy in and have at least 20 buy ins. So for mals minimum recomendation at limit you need to have a $300 bankroll to play 25/50c limit cash (600 big bets)
GL 
Cheers Swinebag - But i was refering about playing 25/50c NL - Which must be Different from limit!!
Buy in for the max, 30 buyins minimum, so a minimum bankroll of $1500