The pioneer bookshelf speakers the old version and new version are very often on sale, they are considered the best budget speakers. You can get a pair for under $100 dollars .
This speakers are getting a lot of attention here.
SP-BS21-LR old version and new version SP-BS22-LR
You can get 4 speakers for less than $200 then if you think the denon is over you budget ,you can look at Acessories4less.com for a less expensive receivers.
Panasonic 65VT60 / Marantz SR7005 / Marantz UD7007 /2 PSA XS30 /Revel Performa3 F206 / Revel Performa3 C205 / Revel Surrounds/Sonos Connect/ Roku 3 / Amazon Fire tv / Xbox One / HTPC / Darbee 5000 /Sonos for bedrooms,kitchen,bathroom/Master bedroom Sonos sound bar/Sonos sub and Sonos surrounds.