Well....dulcimers are some of the most variable & 'personal' instruments around. There are many 'makers' but few companies. You need to find out what basic requirements YOU have for one....size, stringing style (spacing), setup for capo or not, friction pins vs. mechanical pins (winders)...lots more.

My dulcimer was made by Keith Young, who used to do only friction winders, but with fine tuning adjustments at the tailstock...a very 'classic' setup, but tricky to learn for some. He now does regular geared tuners also.
At the festival our group presents each June, we usually have Carl Gotzmer, of June Apple Dulcimers who is also a fine maker.

Both of these make a variety of styles.
DON'T BE IN A HURRY to choose...play a bunch of them and make your decision on what is comfortable.