My friend is looking to purchase a home theater system and need your advice to choose the best on. His budget is around $500. He already has a blu-ray player. After going through online research, he is looking at the Onkyo HT-S6200 7.1 which is selling on Newegg.com right now for $550. Wondering should he go with just a 7.1 receiver and 5 speakers. And the other 2 speakers later when he move into a big living room (recently his living room is 12 X 13)?