Well if you are talking a kit go big or go home.
PERFORMANCE: Top speed: 926 mph; Cruise speed: 620 mph; Initial climb rate: 30,000 fpm; Ceiling: 45,000 ft.; Range: 1,840 nm; Takeoff distance, 50 ft.: 600 ft.; Landing distance, 50 ft.: 1,500 ft.
BEDE JET CORP.
The kit starts at a cool 1/4 million. No engine no avionics, some assemble required. I bet they top out at well over a million when finished.
It would be a cool toy to have.