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At CAZ the standard buy in for a 3/6 game is $100. The games are really loose-passive, rarely going over 2 bets on any street (except on weekends when the lagtard amateurs are out). If the game was really aggressive I'd probably buy in for up to $200, with maybe $300 if most pots were 6-way capped on most streets. I normally bring more with me and reload as appropriate.

It's mostly dependent on how aggressive the game is and how much you can lose in one hand. You want to have enough where you can lose 2 big pots (for the game) and still have enough to optimally play the next hand without missing value because you don't have enough money on the table.