I currently want to upgrade my setup. Current: Creative Sound Blaster 5.1USB as a DAC to Bravo Audio V1 EH6922 Tube I saw someone recommanding the Maverick Audio TubeMagic A1 Amp For my budget now i could only afford one upgrade should i upgrade to a TubeMagic A1 Amp or the TubeMagic D1 DAC? I am using the amp to drive my HD600. Thanks I also came across this on eBay HLLY DAC-01 24BIT 96KHz Tube & Headphone Amp Pre-amp http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=400090274544&ssPageName=STRK:MEWAX:IT anyone has experience with this? How do this compare to the A1/D1?