I want to create a 2.1 sound setup for my computer, and I'm wondering what would be the best choice of speakers and subwoofer. Should I get a pair R-41PM or should I get normal speakers (non-powered) and also get tiny amp for the PC? Also, what subwoofer should I get? I'm looking for something small, since the only place I have is under the desktop. Also, how much do I need a subwoofer for PC listening? I would like to keep the budget around $400. I have one more question: Can I use a powered subwoofer with powered speakers? PS: I'm trying to build this audio setup with Black Friday if possible.