IMO, you really have the wrong amp for your musical tastes. With only 15 watts into 8 ohms, you've painted yourself into a corner regarding speaker options. I wouldn't have reservations playing jazz or chamber music on 15 watts, but you listen to rock/pop 80% of the time. You obviously will have to go with a high efficiency speaker but a lot of times they are single driver and don't really have much bass, which, let's face it, is a big part of the music you listen to most. I was going to recommend my 96db Omegas I currently have for sale, but given your preference in music and the dimensions of your room, they probably won't work. High efficiency speakers, especially in your price range, usually have one driver and that one driver may not fill your size room with the bass heavy music you like. I hear good things of the Tektons. Also, maybe a Zu Essence, if you can find one in your price range. I had a pair once. They may work, but I would sell your amp for one with more power and current so you can increase your speaker options.