I would recommend the spf series from pioneer(http://www.soundandvision.com/content/pioneer-sp-bs41-lr-speaker-system). If you substitute the towers for bookshelves you might be able to come in under $500. This is one of the best 5.1 systems you can find for around $500. I would never recommend an all-in-one system unless it was from a REPUTABLE SPEAKER COMPANY i.e. Deftech/Cambridge Audio,etc.