You might want to run a few searches on the PreSonus Central Station. I used one exclusively before switching to analog/SACD. It's a neutral, powerful amp with a clean upsampling DAC. Makes a nice passive preamp, as well, if you're interested in a speaker setup.
Meier Audio also makes good DAC/amp combos, as does HeadRoom. If you can live without the DAC, the Eddie Current EC SS is a fine amp, as is the Gilmore Lite. You might be able to get a custom Beta22 for that price.
Though for $800, I would take a hard look at a used Singlepower amp. Those are some of the best out there and you can build your system around one.