A little digging I did, I recently was looking at getting a new set of speakers for my computer(ended up getting some Sennheiser's Instead though)
Amazon.com: Creative ZiiSound T6 Wireless Surround Sound Speaker System: Electronics This is suppose to be a very good sound system with wireless speakers, (issues are though that if you want Dolby - You computer has to have the required Codec for it too work correctly, and also the SUB-Woofer seems to be light or heavy hitting, on some orders that people have gotten(slight defect maybe ?))
Amazon.com: Audioengine A2+ Premium Powered Desktop Speakers - Pair (Black): Computers Accessories are a simple 2.0 Speaker system for computers(Includes a DAC controller with the speakers them selfs, but is only useable via USB.(also has a SubWoofer output on the back of the speakers so you can later add one, the unit i played around with sound was very bassy without a subwoofer))
but from my looking around thoose are about the best you can find for the price he is looking at.