Thanks, guys.
I've fixed the non-start issue, although I wouldn't describe it as a repair and wouldn't say it's not going to be a problem again. I started by going through and checking ground connections -- both by emorying and reattaching and also using an old set of jumper cables as a makeshift bridge. It was one of those times when having a lift seems like the greatest thing ever.
But I still had the crank and no apparent gas/spark. So I took the driver seat out to reconfirm the grounds at the DME and triple-check the DME relay. Still nothing, until by chance I gave the top of the DME a tap while cranking the engine. Zoom it came to life, steady idle -- just like it used to.
So I took out the DME, took off the cover and made sure the chip(s) were seated. Back in and I still can't get it to fail. So my fix was just a tap -- which isn't very reassuring. But at least it points to a location -- and a target for a tap the next time I get a no-start.
The bad news is that I might have a DME repair/rebuild in my future.
The good news is that I hadn't ordered a new Crank Position Sensor yet, and didn't have to mess with checking the clearance on the one I've got.
I plan on taking a look at the starter wiring before I put the seat back in. My car has a panel where the back seat used to be, so getting to the starter doesn't mean hugging the transaxle.
