I'm a fan of the Primos Camp Owl and the Palmer. What I like about the Primos call is that it has a barrel which is removable. You can call softly with it on, extend it a bit to get more volume or take it all the way off and you then have a Primos Power Owl for lot's of volume. I usally use the barrel for who cooks for you and just use the power owl for laughing.
I don't think you need a lot of volume anyway. All I try to do is call in an owl or five
and let them do their magic.
P.S. If I get time later,I have a brand New Primos Camp Owl that I'm going to put on here to auction off. You might be able to get one cheap and for a good cause