For 200-300$ they are decent. This range starts the entry level for professional studio powered monitors where you can get more accurate sound, albeit, most likely less bass. If you enjoy the bass that comes from the promedia subwoofer in terms of quantity, you will probably have to hit the 600$ range for a stereo 2.1 setup w/ receiver to gain quite a bit of improvement.
If you need the speakers to be small like the promedias, then your options are further limited. The fuse is easy to replace. I think it costs like 4$ for 3 of them at Radio Shack. Just use a coin to unscrew the fuse from the back and bring it to Radio Shack where they can find a matching replacement.