Helen, Certainly there are many choices. I think since you have such a great machine you should consider a grinder that will compliment your selection. I would look at the Baratza Vario. It is an amazing grinder for the price. Next I would consider the Mazzer Mini. If you really want a special grinder look at the Ceado E37. They will all work well. The Baratza would be the most cost effective and the Ceado would be the most professional.