I'm no DAC/amp expert by any means, but I've recently come across the SMSL M6 via Z Reviews, and it seems like a basic, functional desktop DAC/Amp that fulfills all the required functions of a DAC/Amp without frills perfectly for USD $150. It's powerful enough, seems to have a more than good DAC, looking swell for stingy misers like you and I *wink*
I'm considering getting one myself, especially if I get myself one of the Fostex Mk III or even a HE400i in the future.
Here's some useful links:
The Z Review video review:
https://www.youtube.com/watch?v=1BSJ-_4LKvE
SMSL M6 on Amazon:
https://www.amazon.com/SMSL-M6-384KHz-asynchronous-Decoder/dp/B00WQXEBSG/ref=as_li_ss_tl?ie=UTF8&qid=1468955708&sr=8-1&keywords=smsl+m6&linkCode=sl1&tag=zeos-20&linkId=2b00d63195bc2296f5018b897a48041e
Again, I haven't had any experience with the M6, neither have had experience with a ton of DACs, so take my personal opinion with a grain of salt. Zeos from Z Reviews, however, he probably has too much experience imo.
Nonetheless, hope I've helped!