AA all the way through 22 should be your biggest cash cows with maybe stuff like AK/AQ mixed in there depending on stuff like game conditions and how well you play post-flop.

I like to raise pairs because I raise pretty much anything to build pots and to give me a chance to win the pot without showdown if I choose to go there (I'm no longer a bet-bot.) In passive games where people aren't re-raising much and often not blowing you off your hand, you may as well put in the first bump so your first act of post-flop aggression doesn't do much to define your hand.