Well that line is very different for different people. For instance, the Dragonfly is supposed to sound very good for the price, but most would probably not spend $250 just on a DAC. Could you be a little more specific?
As far as I'm aware, the s715i is pretty much one of the best portable speakers for anywhere near it's price. I had an x-mini once, and it was great, but it eventually was limited by it's size. I suggest you browse Amazon, and read some reviews. They've almost always pointed me in the right direction. Good luck! :)
Edited by tzjin - 7/10/12 at 9:41pm