Have you considered powered/active speakers? With internet connection/control you'd have internet 'radio' and everything on your hard drive available in a simple/small form factor. Powered speakers have a 2 channel amp (matched to the drivers/crossover) inside one cabinet to serve both speakers. Active speakers have one channel of amplification per driver for better matching/control and allowing for a more sophisticated/energy efficient crossover resulting in more dynamics, flatter frequency response, and more/deeper bass output. Note that most active monitors are for studio use and are dry sounding, designed to reveal the warts versus to provide enjoyment.
If you own an iDevice for control you're 1/3rd of the way home. Add Airport Express for $100 (you have a computer available, right?) and one of the following (all meant for home use):
For low volume/casual listening (all small and powered): Audioengine A2 ($200 - easy/laid back sound, mid/bass hump); Audyssey Media ($210 - dynamic, good mid/bass punch, mids recessed, highs can be rough, good imaging, includes DAC); NuForce S3-BT ($300 - smooth warmth, pristine treble); PSB Alpha PS1 ($300 - wide sweet spot, clean, clear, delicate)
For more serious use (all active designs unless noted): Adam F5 ($500 - highly resolving, full bass, open/forward/up-tilted sound, refined/non-fatiguing); Emotiva 4 ($350 - good value, detailed sound, big soundstage); Paradigm A2 ($600 - DSP extends bass at lower spls, multiple connection options, lacks warmth for acoustic instruments); Vanatoo Transparent One ($550 - cherry finish, DAC, multiple input options, serious bass, honest use of DSP, powered - not active)