Erik, while playing a tight-aggressive style is good for cash games, you will probably have to loosen up a bit to succeed at a tourney. The escalation of blinds makes it hard for you to have a useful stack if you don't catch enough cards early on.
Keep in mind that you are usually going to have fewer players seeing the flop in a tourney than you would in a cash game. This makes hands that are pretty marginal (i.e. top 2 pair) a lot more powerful than normal.
Play aggressively with position as much as possible. Don't discount any hand that has an ace and one or 2 more high cards, especially if the ace is suited. You will have a lot of guys playing nothing but A2xx hands, so your ace with a king kicker has more balls to it than you'd think. You are looking to take full pots, not halves, and you'll rarely do that with a weak A2 hand. That's not to say you don't want to play the good low hands, but don't over estimate their value, since you will rarely get 3 or 4 guys to the river to pay them off well enough.
I used to play a very tight aggressive strategy in limit O8 tourneys and when I caught cards it was great, but when I didn't it really blew. There's nothing worse than spending 2+ hours to get sucked out near the bubble. Now I'd rather build a stack early, or bust out early trying.
Good luck.