I am using Wharfedale MovieStar 60 before which just cost below $2000.
http://www.amazon.com/gp/product/B000077CLZ/103-6002286-2895832?v=glance&n=172282
Or you can choose to use speaker collection 5.1 come with amplifier so that you do not need another AV amp. 501R price is about $2500. We are using that in office and quite ok with this price range