>>28558187 (OP)
$500 for something you can wrench on and easily modify to do 60 mph+.
Engines sub 200$ from Harbor Freight.
Robust aftermarket ecosystem available via amazon. Sure, half of it is trash but you guess and check until you find vendors with okay quality control. Returns baby!
Stock predators have magnets in the flywheel so you've got a 12V rail for lights, signals and stuff that keeps cops from bugging you.
Where I'm at you can do a sorta-scam the DMV, file for a lost title and actually register and drive them if you have a moto endorsement and insurance has an 'other' option for bike type.
What isn't to love? I ride a Ducati normally but have one of these for midnight shenanigans with friends.
Btw, you can buy frames straight from coleman parts.
https://parts.colemanpowersportsusa.com/parts/mini-bike-parts/b200rsv/Frame