Turret lathe, and with cross slide tooling. Those lathes are good for making multiple parts quickly. They do not have threading or power feeds or feed dials, significant issues with doing custom one off work. Another option is to get a turret and a second operation cross slide and add it to your ordinary lathe. Then you can switch from custom work to production work pretty quickly, have your cake and eat it too. I know that is possible on many Logan lathes, and it is probably possible on some Hardinge, Clausing, and other lathes.