I used a buddies $400 Foxpro this weekend and it is amazing! I called in a pack of 6. They were hung up probably in their den and the "rabbit" wouldn't get them to bite. So I switched it to the "hot mama", then the "challenge", then the "pack call", then the "pups yipping" and I don't know if it was the sequence or what but they were coming full bore all out and they meant business. Unfortunately, my dumbass best friend told his boy to shoot at them while they were running in and....But that call sounds so real and carries sound so far.
On a side note I have a $55 Cass Creek cheapy and we called in 5 dogs in 2 days. So, I think they all will work. But I'm not sure the Cass Creek would have worked on the hung up big pack.
Just go get what you can afford and get you some dogs.
HK