I just ordered a pair of Sennheiser HD800's. They were so cheap on eBay, I couldn't resist! Thing is, the rest of my setup has yet to catch up with that recent purchase. I'd been using a Millet Hybrid MiniMax tube amp to power a set of Hifiman HE-500's, and all was well (at least to my neophyte ears). How will the HD800's respond to that amp? Seeing as I just spent a pretty hefty sum on the cans, I don't want to upgrade the amp for awhile unless it's absolutely necessary. If I do have to, I want to get the most affordable amp that will get the job done at a reasonable level. Any recommendations?