Colt for straight, Harp for fade. As others have said, there are a million options that work beautifully. Handle a few stable putters, see which ones feel good in your hand, and throw them a bunch of times and see how they do. Adjust from there.
If it helps, you will probably try out a few before finding your favorite. I certainly did, which is why I have so many putters on my trade list.
Good luck!