[TTChamp]

I think limping is best. You are giving up some equity pf, but I think you make it up post flop because they have a hard time putting you on an ace and if you miss the flop you aren't tied to the pot.

Think of it this way: if you limp and miss the flop you lose .5 sb. If you limp and hit you are more likely to get action on your ace. So you win a lot, lose a little.

If you raise then you are not likely to get action when you hit your ace, but you are out of position and likely to waste bets in someone elses pots when you miss.

I don't think that a4 or a7 are different in this regard. With regard to BB's stats, I might be more compelled to raise if he was very tight.