One of my favorite calls that I use is the Crit'R call. It is a open reed call and like all open reed calls they take a little to get use to. But you can really make a lot of different sounds for them ole song dogs.
I also use another call that is made for calling elk, it is a "cow" call with a rubber band. Its made by E.L.K. Inc.
There is a good site to go to for a lot of different call and it is;http://www.allpredatorcalls.com/?source=Overture