re: Poker & aggression in tournament
Maybe it's semantics, but I think the idea is that you should always be aggressive when you're in a hand, unless you've got a specific reason for being otherwise (say, you've got a good hand and you're up against a loose player who you know will keep betting into you if you just call each time).
The choice you're actually talking about is whether you should play loose or tight in the early stages, I think. Both have their advantages and disadvantages, it really comes down to what you're most comfortable with.
If you play tight, the general theory is that people will recognise that you're playing tight, and later in the tournament you can play off that image to steal blinds etc.
If you're playing loose early on, however, you might win a number of small pots, but people will start to realise that you can't have a good hand every time you enter the pot, and they'll start to play back at you more often.
The strategy you're discussing here is a somewhat loose one, I think. That's fine, you'll just need to know how to adjust your play when the blinds go up and the rest of the table catches on to your style (ie: when they start calling your bluffs or raising you back, you need to tighten up a bit).