I like both amps. The WA2 is OTL I believe and the 6SE is transformer coupled but will both do nicely with your 650's. They do sound different. The WA2 is supposed to be a nice preamp and can be built with a remote.
I just heard on the Sirius Jazz station that Dave Brubeck was playing for free at the Apple Store in SoHo today for the 50th Anniversary of the release of Time Out.
I did what I thought was not possible. I settled my case saving me from a trip to Pensacola tonight and then 5 or 6 more days there next week. I am now home on the patio with some PVW 23 and rockin the JH13's.
Wait a minute, doesn't Ray have a switchbox? Dinny, I'm sure he would let you borrow it. The best part about it is that everything always sounds the same.
There is a difference, you absolutely need the JH-13 Pro. It's a game breaker that changes everything. Once you do buy it, you will (you will) want to sell all your gear, buy a G Lite JH-13 SE amp, pico slim and a HifiMan.