NLTRN guidelines for 3-betting or calling 3-bet pf?

[Jukka]

I noticed that in the latest couple of threads there has been talk about 3-betting pf with a good hand (AJ for instance). I went through my PokerTracker and noticed that I three-bet very rarely (about once every 400 hands). I don't like to put too big portion of my chips preflop because I might be forced to fold on the flop when I don't hit.

What kinds of hand ranges do you have for 3-betting and how often would you do it as a bluff ?

Another question: what hand ranges do you use to call/reraise a 3-bet ?

Please consider different scenarios (both players have stacks around 1500) for blinds of 10/20 or 30/60 when oop or in position (after the flop)

Here is my thinking:
When the blinds are low 10/20 I would be inclided not to 3-bet even with good hands, because I might be able to use opponents aggression to get more chips in when I hit the flop. Especially in the case he is very aggressive and I have position.

When the blinds are higher 30/60 I would be still a little reluctant to 3-bet pf with hand like AJ, because if my opponent pushes I am not sure where I am. With AJ might be inclinded to call the push, because theres so much in the pot already (I am probably getting odds around of 2:1). However in my thinking, why would I want to risk a coinflip (if I am against a pocket pair), if I think I have edge playing post-flop (I have position for instance) ?