budget towers? $500/pair

I am a novice in the knowledge of world of high-end audio equipment. I am looking to buy two very budget-minded towers that will fill a small/medium sized room for movies/music. I have a set of yamaha HS80m studio monitors along with the matching sub, and I am very happy with how these sound within a 5' foot range (i.e at my desk mixing music etc). However, these speakers do not seem to have a room filling sound any farther away than a desk seated position in relation to them on account that they are near-field monitors. Does anyone have advice as to whether or not I should stick it out with current monitors or upgrade to a 2.1 tower config for movies/music and if so which brand/model?