Best First Bike for 10yo???

[CaesarVis]

My son caught the dirtbike itch and he has to have one now. He's 10 years old and is 4'8.5". He loves the Kawasaki KLX110. It's the perfect size now but will probably be too small in about 6 months. The Yamaha TTR-125 is a bit big now but will probably be perfect in about a year. The only problem is these things are both EXPENSIVE.

I have been looking through all of the bikes on Orion Powersports. The Apollo RFZ DB X-6 looks like a fantastic first bike for him, especially with the automatic transmission. He really needs a semi-auto or auto transmission. Does anyone know how the gearbox works on these automatics? Is it gears or something like a go-kart torque converter? Also, does anyone out there know if there's a huge difference between the X-6 and the X-16?

Does anyone have a better recommendation for a good first bike?

This is the one I'm looking at the most right now:
https://www.orionpowersports.com/apo...embled-tested/