Interesting, I have the WA6SE, which drives the HD800 beautifully. I am looking for a future upgrade to a WA5LE. Now you say that they may sound the "same" makes me rethink about buying another Woo. What are alternatives to the Woo lines, say in the money range of the WA5LE?
Honestly for the price the WA5 is priced at, it is a joke for the sound performance it offers. Though the amp sounds more solid state then being of a warmer tube sound sig. Majority of the Woo amp's sound similar in ways to another. There's a saying among few experienced users more so than myself: "Once you heard a Woo, you've heard them all".
Well regarded amps for around the same price would be the EC and DNA lineup etc.