Well I do cash games not sngs so you'd need to open up more as blinds got higher and your stack got lower compared with the blinds, but I've found this is my general range.
EP: Raise with: AJo+, ATs+, JJ+, limp and call a raise with any other pocket pair (if we have implied odds
to set mine)
MP: same as above, plus I'll start limping with a lot of suited connectors if there are callers before me. Also, if unraised and stacks are big enough in front of me, I'll raise with 99-TT now.
LP: With no limpers or raisers, button or one off I'll consider raising ATC. I don't do it every time, but especially with tight opponents, it's a mistake not to take the free money. In position, it's a lot less about the cards I hold than opponents.