Here are my personal preferences.
My stats on NL100 are 12.05/8.38 with AF of 2.1
EP: from UTG I open raise any pocket pair + AK
I fold all the other broadways, but from UTG +1,+2 most times I include AQs and AQ(just sometimes)
MP1: if first in, I raise, AJs+, any pocket pair, KQs. Most of the times I actually fold KQo and AJo(I hate these hands).
MP2: add AJo, KQo and KJs to the raising range
MP3: this is where I loosen up quite a lot(same rule applies - IF FIRST IN) and start raising some ace rags and the suited aces, sometimes even suited one gappers and suited connectors + KJo, K10o and such
CO and BU: if first in I raise at least 50% of the hands from late position - I mix it up, sometimes I raise 3 BB, sometimes I raise the normal amount. This way they can't guess whether I am stealing or not.
and rule number one: don't limp first in
I consider this very important. The hands mentioned above all aplly if it is folded to me.
I don't overplay KQo and KJo - these are not very strong hands in full ring and I personally prefer to fold them in EP and in MP1 most times.
It is a matter of discussion whether raising any pocket pair from UTG, UTG+1 is a fine move but I've become used to it and it is harder for people to read me.
I feel better when I have the initiative, and I almost always want to be the pre-flop raiser. I cold call/limp just pocket pairs and suited connectors and some suited aces or kings in late position(if it is folded to me of course I raise) IF I believe I get the right implied odds.