I would get bookshelf speakers and some better subs. There is no need for tower speakers in your situation. They are not as portable, and they don't offer much benefit over bookshelf speakers when subwoofers are used. Monitor makes some good bookshelf speakers, I would look at some of them. I would also be looking at KEF, Wharefedale, and Revel. I would sell the JL Audio sub and get a couple Hsu subs or Rythmiks. Your Yamaha AVR will be adequate to drive these systems, although if you want to crank it, you might think about getting an AVR with pre-outs, and getting a separate amplifier.