OK, well a Sunn 200S dropped into my lap from Craigslist. The price was right (~$300) but it only has one JBL. However, it sounds amazing with the Showman. Big and clean. Last night we had to scramble to get on stage with very little time to get organized. I had told the soundguy that I wanted to mic up the cabinet with the RE20 I had brought with me. He was skeptical, but in the confusion to get going, my DI never got a mic cable. 3 minutes into the set, he came up to the stage and flashed me a sign saying Where's your DI signal? At the end of the set, I told him that it never got plugged in, but he didn't care. He told me he wouldn't even use it even if there was one, because the mic sounded so good.
So, the next step is to get another JBL happening, fix up some of the infrastructure issues (it's missing the original screws for the back, the washers and the bolts holding the speakers in and maybe get a Courtenay Pollock for the front. It's so weird to go back to basically the rig I had in the 70s in high school and realize it's what I wanted all along! I think maybe if I had known about flatwound strings, I would still be playing my original set up.