These days, if the blinds are big enough to be worth stealing, I rarely limp. I usually start stealing @ the 25/50 level. If it's good enough to play, it's good enough to raise. Meaning, if it's 10/20 level (blinds aren't worth stealing), I'll probably limp UTG w/ 88 or AJ type hand (although I'm more inclined to just fold AJ/KQ early in tourneys in EP). Plus, I usualy won't get stacked when I have 88 and I like to give myself as many opportunities to get "lucky" as I can get. If it's a marginal decision between folding and raising preflop, I'll probably choose to raise.