Little advice, open your eyes, and learn how to ride.
I haven't seen a Doo keep up in the trees on either my Axys or my 17 MC. I have seen them try week after week, winter after winter.
The chassis just isn't as stable. It isn't predictable enough on tight up hill off camber insanity that has become FUN to ride on sleds like the Axys and Mtn Cats.
Maybe with the mods listed by the Doo fans you can fix this stuff but I choose to just avoid that PIA with better choices.
That Cat is just as reliable as the Doo. Just as light as the Doo, just as narrow. The Cat has better boards, shock package, track and clutching right out of the box.
I fail to see the allure of either of the other two check options. IF the Poo motor is actually a decent piece I would consider going back that way. To me though, the Alpha would be the no brainer, especially with more great reviews above.