Well he's got a couple of options. The 445 for those who like 45 tubes. A few people feel the 2a3s are better though for the HD800 (preferences of course)-plus the 2a3s have roughly twice the power which is a consideration if running speakers/HE6. They are both a slight trickle-down of the Leviathan-so reading up on that may help you decide. I think Craig's still out of town last I heard.