I mostly do digital music, but do have a nice record collection.
I have four Dacs. They are good for different applications.
Here on the porch I have a BenchMark Dac-1 Pre. It is just excellent, but is not cheap. I have it matched to good components.
I have an old FUBAR I put new opamps in still running my bed room computer TV movies.
I have a tiny one tube Dac for my netbook -> cute as hell, and also one that just looks like a thumb drive. I can't hear a difference, but I play the net book mostly on my boat with lesser quality gear.
I wanted one for my main system to upgrade my vintage CD players. Since they are worth little (but I like 'em), searched long and hard. An older quality CD player with a modern DAC is better than many high end players from just a couple years back.
I bought this one:
http://shop.grantfidelity.com/Grant-Fidelity-TubeDAC-11-D-A-Converter.htmlThis is very good for the price $325, and is the latest thing out there. If I need another or need to replace any of the above, would get another of these.
For sound improvement, it is hard to beat. I have not done a head on comparison with my other Dacs as they all work well in the systems they occupy. A DAC is just one piece of the puzzle and should be matched to what you have.
Still, I highly suggest you or anyone give this a try before paying a bundle. Dacs are in demand, and the tech of it all is improving rapidly. A used $3000 DAC (or high end CD player) from a few years back goes now on ebay for a few hundred and that is a joke unless you need the name bragging rights. I think DAC improvement has been the giant step over the last years. I also think adding a better DAC to your system is the best bang for the buck.
If you can, get the BenchMark of course, but I doubt there is a thousand dollar different in my BenchMark and this tube job. You can upgrade it just by rolling tubes.