If you don't care about the latest technology, but rather how it sounds, you might want to consider Aragon's D2A MkII DAC. Although it is quite old (early 90's), this DAC had an oversized power supply, uses an 18 bit chip, is built like a tank, and most importantly, it sounds great. In fact, it sounds better than the MSB Link III with all of its options and most other DACs out there.
They usually go for about $250-350 and pop up on a monthly basis.
Best of luck in your search.
Kevin