Since the Echo Dot doesn't have a great internal speaker, and I'd like to use it to listen to music, I was wondering if a DAC/AMP for external bookshelf speakers would be advisable? I've been looking at the various DAC/AMPs that come up on MassDrop as well as the tube amps and 'retro' speakers on Monoprice (https://www.monoprice.com/product?c_id=109&cp_id=10919&cs_id=1091903&p_id=16157&seq=1&format=2). I'd like something reasonably priced that will work with external speakers. I'd prefer a combo DAC/AMP for convenience, but I'm also willing to stack if that's the best way to go without spending too much money. Budget is about $200.