With your MX experience Shifter karts may be the way to go for you
The initial investment is not too bad, and the maintenance is pretty affordable, if you stay with Stock Honda, but TM ICC motors are not too bad either.
Unless you wanna go slower with a single speed kart, then that all depends how slow you wanna go.
Another thing to consider is to check what engine package your local track or surrounded areas run ( you don’t wanna be the only kart in that class )
Also are you planning to race? Or just the weekend warrior?
Shoot me a PM, we’d be glad to help, we have several karts available
Here’s a video of a track near you, enjoy. Let me know. Freddy.