I picked up a used Foxpro FX-3 for $300 and have been using it for about a month.
I'm really impressed so far. I've called in 3 dogs in my last 10 stands.
In fact I killed my first coyote with it a few weeks ago.
Beware... your in for a terrible addiction
I'd Rather Make a Slow Hit Than a Fast Miss!
Go to foxpro's web site and predator masters dot com forums. Select a Foxpro model that suits your needs and your done. The predator masters forum will allow you to see Foxpro's second to none customer service and research just how good they are. I will suggest you go with a remote model. I called in 2 coyotes and one bobcat on the first stand with my new Foxpro a few years ago.
I would go with the Wildlife Technologies the price has come down and they are by far the best made in my opinion. They have a huge sound selection and if you call them they can set you up with what ever sounds you need. They are the clearest sounds that I've ever heard in any wildlife calls even at full volume.