Have you considered a headphone system? An AudioQuest USB DAC/headphone amp is affordable and sounds amazing with every model of Focal, Fostex, and Sennheiser headphones I've listened through. You'll get more bang for buck and can put it all in the drawer when you're done or take it all with you.
But to answer your question, I've honestly never heard affordable speakers that sounded good except DIY home built speakers. If you're willing to build the speakers yourself then you can get both good sounding and affordable. I feel that the closer I get to the speakers the easier it is to hear that they are cheap. By building them yourself you are cutting out a lot of hungry mouths such as the speaker builder, the parent corporation, the distributer, the showroom overhead and the sales person and they will be affordable.
Best of luck to you!