PC Speaker suggestions

Hey guys, A long time ago I bought a gateway PC. It came with the boston acoustics BA7900 5.1 surround system. I've built a few pc's since then, but have always used these speakers. I always thought the sound was amazing, and the bass was very powerful. Lately I've been having a problem with a short in the master volume knob on the control unit. I have to wiggle it for long periods to get the sound playing through BOTH front channels, it tries to play through just one at a time. I don't really care about the surround anymore, so just a good 2.1 system with comparable bass and power is what I'm looking for. I would just replace the control unit, but I fear this is so old I won't even be able to find the speaker system itself, let alone one component from it. Checked a couple of sites and the system was labeled out of stock. So, I think I need a new setup, but I don't want to downgrade to less sound quality. Price is no object, unless you're talking like over 500 or something. This systems sub-woofer is an 8" in a vented enclosure. Want the bass. Any suggestions?