Esp since BB is a half stack, I'd 3-bet ai otf or raise him ai ott. Can't give him credit for a str8 yet, if ever, that's a small part of his range. And I agree with spoon about over-limping less-than-great broadway in the SB, that should be +EV. Usually I'll over-limp suited connectors, suited gappers, suited aces and kings, and broadway, hands that can flop alot of equity, and only isolate from the blinds with hands that completely dominate villain's range, like KQ or TT.