Just gonna throw in the obligatory ODAC recommendation. I have no idea why it hasn't been recommended yet, or why anyone would want to buy something with similar technology, but half the price. Why not pay 50ish more dollars and get the real thing?
You don't want a warm dac, you want warm speakers, or maybe a warm amp.. never a warm dac. You want an accurate dac :) At least, that's what I think you should want :)
I was looking at the ODAC on the JDS Labs website. Is there any benefit to having the RCA output as opposed to the standard 3.5mm jack? Will the RCA output deliver a higher quality sound to my receiver, and if so how noticeable will it be without really high end equipment?