If you start with a small system with quality speakers, those speakers can always be integrated into a better system after graduation. M22ti mains now will make excellent rear channels down the road for a 7.1 system, or would be perfect for the "bedroom" system later on, when you go all out for the kick-ass HT system later.

If you buy some crap shelf system now, it'll end up in the trash 4 years from now.