Darian, welcome. If you don't get a full 5.1 system at first, I'd suggest that you get the surround speakers for a 4.1 setup rather than the center speaker for 3.1. The main speakers can be used to form a "phantom center" at least initially. You haven't described the size of the room, but a first thought would be to use M22 mains with a sub plus QS4 surrounds. Then, an HT receiver and a CD/DVD player would be necessary if they don't have them now.

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Enjoy the music, not the equipment.