System for a teenager

I need advice to build a system for one of my sons school mates and his father. I have been advised to keep budget as low as possible but strive for quality sound.

My idea is buy used gear here at Audiogon starting with 2 series Vandersteen's, DVD-CD player with volume control and moderate power tube amps.

Would especially appreciate ideas for the DVD-CD with volume control and ideas for moderate power tube amps.