In one of my setups I have a Beovision 7 with Beolab 7.4, four Beolab 3 and a Beolab 2 as sub (so 5.1). I really like this setup for watching movies and casual music listening. Also it is quite a minimalist setup. I think one of the most important, and also quite cheap things, is speaker placement and setup in the room. Get a thick carpet and try to reduce reflections in your room.