Go with a two channel stereo setup now, for music and movies. It's a good way to see if you want to upgrade to a full surround sound setup.
Reciever: Denon, Yamaha, Onkyo, etc. Get a surround sound RECIEVER that you can add speakers too later, after the 2 channel stereo setup. A reciever is an AM/FM tuner, a Pre Amp, and Amplifiers all in one box. Spend $500-$700 here, it's worth it.
Speakers: Skip the Bose speakers, they are over priced and I know it, I have some 301's. Get some small bookshelf speakers (Mom will like ) I'm biased but here I suggest Hsu Research HB-1's ($129.00 each). Click Here for website. Your going to want a small sub with small main speakers. The sub can be put in the corner, hidden away. It has it's own amp, and your reciever should have a sub out jack on the back. I have a Velodyne Minivee that is small, but expensive at $800.00 but it rules. Bought mine at Circuit City.
DVD Player: Buy what ever you want here, but something that match's the reciever is nice, sometimes you can use the reciever remote for both if they are same brand...Sometimes. You can play DVD's, CD's, etc. all from this unit.