Thanks for the replies!
I've been using an awl and that's fine most of the time but I'm looking for a one-handed tool. I saw someone doing production turning and he used a spring loaded center punch. I made a bunch of small things for Christmas and realized it would have been quicker and easier with the center punch.
Damon, that's the one I've been looking at on Amazon and I think I'll give it a try. If it doesn't hold up I may move up to the General ($$) or the Starret ($$$).