I have a Hoochie Mama, a Hoochie Mama Calf, a I-Maka-Da-Bull-Crazy and a Cow Girl call. I don't even carry the Hoochie Mama or Hoochie Calf call with me any more and I think I'm going to start leaving the I-Maka-Da-Bull-Crazy home as well.
I've been practicing with a mouth reed diaphram call and it is so much better than any of the other calls. I use it 90% of the time now. The Cow Girl has a really high pitch that I can't get with my mouth reed so I will keep carrying it as well.
Knowing when and how to use a call is as important, if not more important than the call itself though.