I'm looking to buy the rotary attachment for my Speedy 300 80w CO2.

Any recommendations on which holder is most versatile - cone, rollers, or chuck? Heck, I noticed they offer three or four different chucks.

I don't have anything specific planned for it yet beyond learning to engrave tumblers. Just trying to understand the options.

If anyone has a new or lightly used one they want to sell, please let me know. Otherwise, I'll be calling my rep in a couple of weeks.