[denjo]

    Perhaps you may want to consider the Neko Dac http://www.nekoaudio.com/
    I am using it with my Imac (running Pure Vinyl/Pure Music) and the sound is very Good. 
    It falls in your price range.

The Neko DAC does not do USB direct but requires a SPDIF convertor. Just something to bear in mind when considering this option.

[low.pfile]

Gordon determined that my Brick v2 DAC had old code which caused the distortion. The solution was a software update via ROM swap. He was correct, after the update, the wonderful sound is back in my system: iMac i5 > Brick v2 DAC > Modwright SWL 9.0 SE Sig > RWA Signature 30.2 LFP-V > Devore Nines 

crusing through my audio demo/text tracks as I write this. YEAAAAHHH!