I've been happy with Oneway handles and Trent Bosch handles - the latter can be filled with shot to improve vibration dampening and give the tools some "weight". Got about 4 Bosch handles so far... I have also used Hosaluk handles which work well too!
Alternatively, you can turn your own handle, add a ferrule, and join the progression of turners having done so for hundreds of years....
I still do both....
Rob