By the way, maybe I could splurge on a LD MK IV instead :-)   http://cgi.benl.ebay.be/ws/eBayISAPI.dll?ViewItem&item=190892010143   Or is the SE version really worth the bump?

Hey all,   I have read that the HD650s really pair up well with a tube headphone amp so I've been looking around reading about affordable tube amps the past few hours.   I haven't had the Rhinelander for long, about a year now, but I feel my HD650s could sound even better. Don't get me...