Great start! If I were you, my next audio purchase would be floor coverings. I'd get a rug that covers at least 75% of the floor along with some tri-corner absorbers like "Corner Busters" or "Corner Tunes." Echobusters, however is currently undergoing "business restructuring" so you might have to wait a little bit on those. Tri-corner type absorbers are pretty inexpensive (about $180/4-pack) but are super effective at taming midrange issues.
