[kado]

i say either when the board pairs you bet around 1/2 the pot, this also rids you of losing money later if you catch your hand because you know the set is out there if you get called (especially if you have more than one caller). when the board it 7-5-2 be careful but 1/3-3/4 pot bet is decent but you want to take away some of the odds if they happen to play low connectors and have a draw.