If you're playing at a $5 min. table and your min. bet is a nickel, there's no problem buyingin for "half & half" (i.e. 20 red and 4 green). It only takes the dealer a split second to fan four greens and keep them as your "backup" pile, especially if you intend to spread to $10 or $15 occasionally. If you are comp sensitive you can also make your larger bets at the beginning when the PB is rating you. Best of both worlds.