I would be tempted to raise all in, it negates me being out of position on the flop. It seems quite likely this guy is raising with an average hand because of his position. You could put in a standard raise to say 6000, but that commits you to calling a push anyway so no point.
If your move goes to plan, the fact that he is two to your right affords yourself some protection from him stealing later if he knows you're prepared to go over the top. You may then have an easier ride when you are in the blinds.