Thanks for the input, Jim--you've ridden a lot of bikes, and I figured you'd have some intel. Yeah, guys who own them and articles I read say the 300 EXC is really a different machine because of it's low torque that allows you to keep it a gear "too high" and tame it down or kick it down a gear and let it rip your arms off when you want the big thrills.
I keep hearing, "I loved my old KDX" from people over the years. That one I posted above looked GREAT...but it's gone now.
That KLX 300 looks really clean, and I bet it would be a really nice trail bike for lesser experienced folks...but for me personally, for where I plan to ride it, the 2-stroke power and weight is enticing.
I'm not in a hurry, and I sure don't need another bike!...but I do enjoy taking people riding and introducing them to this stuff. Last Sun, all 3 of my KTM's had riders and then the 300 EXC had an issue that kept it from idling.

I'm going to clean the carb this week..and inspect the reed valves--something I've never done. xr-nut (Joe) gave me the 411 on those and I watched a YouTube video explaining how to inspect them. Looks easy.