I think thats pretty accurate.   There seems to be 650s everywhere.    My buddy just bought a brand new 25 XCR650 for $16600 a couple of days ago.       

What hp is the 650, 135 ish?

I bought two stroke kept 900 ace. Polaris chassis is made for a light weight motor. Four stroke version don't handle anything like 2 strokes do. 650 is a good choice. 

The difference is that I haven't scratched my itch, and likely won't. It's not the motor, although both available Polaris engines are good; it is the Matryx chassis that really interests me. If the Poo had even a slightly more entertaining 4S motor, I would own one.

From 4 stroke back to a 2. I thought I was only crazy one