Latinsamba,
For whatever reason Wavelength DACs don't get a lot of talk here. Don't know why, as the guy behind it and the technology he developed are highly respected here. The Brick is probably a good choice. You know this is USB input only, correct? It is asynchronous USB input, which is quite important (vs. just USB).
Another good candidate would be Wyred4Sound DAC1 (I beleive $1000) or DAC2 ($1500). The DAC2 has a built in preamp too, and a host of inputs beyond asynch USB. Very well reviewed.
The Tranquility gets very good comments here, albeit always from the same few people. The manufacturer discloses no info about he's doing, so can't comment. I have not heard this unit. I know it has only USB input, but I don't know if it's asynch.
I hope this helps.