I too have a HK450 Pro - Belt-drive tail.
Turnigy Typhoon 450H 2215H Heli Motor 3550kv 11t pinion
Turnigy Plush 30A ESC - Turnigy 2200mAh 3S 30C Lipo Packs
Align DS510 Rudder servo
Savox SH-0257MG servos on cyclic (originaly Hitec HS65MG)
Microbeast Flybarless with V3 firmware
I conveted it to flybarless by modifying the original head.
The mod is fairly simple.
I've compiled step by step instruction in Word format, if anyone's interested.
I'm really happy with the heli. It is sooo stable and predictable.
Getting about 6 minutes of fairly agressive flying at 2800 head-speed.
(Flybarless contributes positively in so many way!)
I previously flew a Trex 450Pro
for quite a while... until it was stollen out of my car...