Music for small get together (what are my options)

I'm not sure if this is the popular opinion, but if I were you, I'd look at Parts-Express, and build your own DIY home audio. I'd recommend looking into Dayton Audio specifically, as they're no-frills, performance-oriented drivers that sound great and are cheap. For instance, I'm planning on getting a few 3-4" fullrange speakers for satellites, and I plan on building bookshelves for the front, consisting of(most likely) an 8" woofer, 4" midrange, and 1" tweeter, or a 10" woofer, 6" and 3" midrange, and then a 1" tweeter. I don't know for sure if I'll be getting a 1" tweeter, or something [i]slightly[/i] larger, but that's the plan.

A nice center channel would be easy as well, along with a nice subwoofer. I have a plan to go full Dayton Audio in my car, with a 4" midrange and tweeter in the kick panels, 7" woofers in the doors, with two 15" subwoofers placed in an infinite baffle setup on my rear deck. As you've just seen above, I've got a similar plan for my home theater.

But what do you mean by easy to move? Do you mean the speakers specifically, or the whole setup from room to room, or do you mean moving it entirely from one house to another, frequently? If that's what you're implying, then I'd just make two-four(depending on the size of the room, listening positions, etc.) bookshelves and a sub. You'll need a receiver(probably with USB, unless you're okay with using 3.5mm to RCA adapters) and an amp.