i agree with pgil. You're making the best bang for your buck by seeing a cheap turn and flop. So calling would be the best option against this type of player. Calling also give the least information in this case. Any card will scare him because he knows he bet weak and you can have just about anything.

I've folded pp in this same scenario many times only to see the turn would have made me a set.

I like the preflop raise to be about $1 in this case because the blinds are still in the pot. Though you're .6 did isolate the mp.