I would recommend that you get a hand held turner. I have used a Lyman bench mount turner and it was very inconsistant. I also have used a friends K & M hand held turner which is probably the Cadillac of turners. It has a lot of attachements including a cutting mandrel to remove do-nuts
K and M Products
It can be expensive with all the attachements
The turner I have is much simpler and suits my needs perfectly. It is the Forster hand held turner
Hand Outside Neck Turner
What I prefer about the Forster is that it has a much wider blade than the K & M for a smoother cut
and you can get inside neck reamers that will fit in the same place as the regular mandrel for inside neck reaming and removing do-nuts if necessary
I do a lot of turning for custom tight necked chambers and the Forster works for me.