You will want players with less than 1 foul per 10 minutes played.
That's exactly what I look for. If you check my team, you'll notice my players are as calm as puppies. No more than 2 fouls per game, except for one pivot (average of 3 fouls per game). As I said, I bid on this player while thinking it was his teammate (I was distracted). They both had the same skills, but foul average changes everything.