Amazon.com: Logitech UE 984-000304 Boombox Wireless Bluetooth Speaker (Silver): Computers Accessories
I'm a dancer so having music sound good and be highly portable matters a lot to me. This is the best thing I've found in that area. Logitech acquired Ultimate Ears at some point, the guys that make the incredible IAC headphones, and this thing has really good sound reproduction and great battery life. Not sure if that is what you're looking for, but I can't recommend it enough if it suits you.