The Objective 2 Amp and the ODAC (Objective DAC) Massdrop has an affordable version -.notice it's two units. The guy who invented/developed the O2 and ODAC was allegedly kind of a remarkable fellow who decided not to enter his invention into the traditional streams of commerce, rather than paentning the design, made it available to anyone who wanted to produce them, via Creative Commons, so long as the product they produced did not deviate in any substantial way from his design. The units are produced now by at least 3 different companies and is very highly regarded equipment almost universally. I own it as a single DAC/AMP unit made by Mayflower Electronics (Objective2 and ODAC; Rev. B) which has a regular price of $229 - sort of within your range - h optional RCA connectors on the back, which allows me to listen to music through powered speakers as well as through headphones., and I consider it to be the irreducible sine qua non of my desktop setup. I would sell off everything else before my O2/ODAC. I haven't heard it but I would be shocked if the Massdrop version was not identical in every way to mine other than that it is in two-unit form from Massdrop and my particular unit is not.