I would suggest you get the Oneway chuck that comes with a screw for
bowls. I haven't heard too many positive things about the Nova but you
can't go wrong with the Oneway. Vicmarc is supposed to be on the same
level but priced a bit less. I don't own one so I can't vouch for it.
If you want economy then get the Oneway Talon. Once you get addicted
like myself, you'll have more than one chuck.