HDVD800 drives the HD800 pretty well, so it's hard to find a good comparison on a cheap budget (otherwise why would everyone buy the HDVD800?). If you don't mind not having the balanced output, I've been using the Lehmann Linear as my main headphone amp for HD800 for many years with good success with my classical collection. It was the original demo headphone amp I've seen used by Sennheiser for HD650/800 before HDVD800 came out. Also the cheaper Violectric/Lake People are popular too. Beyerdynamics has the budget A20 but it's not as good as the A2, and I think Mojo is much more capable. If you want more richer colour, Luxman P-200 might also be interesting, though not as high powered. Exactly on the $1000 mark, I recently found the Musical Fidelity MX-HPA sound quite good with excellent driving ability, free of gimmicks. In the end, driving ability is not the only thing that decides upon the sound quality, so testing and trying as much as you can is the only way to go. Many people will find Mojo far superior to HDVD800 for HD800, so i'ts pretty subjective.