Ok, so I've narrowed my search down to a modi 2 (not sure I need the uber) And either an Asgard 2 or Valhalla 2. I'm going for a hd 650 and using a MacBook Air. Now before anyone asks go search around, I have, and had plenty of information.(still confused) I know that the Valhalla's bring...

Hi I am about to get the sennheiser hd 650 with moon audio silver dragon v3 And I was looking at the spl phonitor mini or the auditor but they're both a bit pricey imo. Can you recommend a good amp that'll suit the hd 650 ? And I'd like the amp to be no more in size than the mini (the auditor...