If I could afford one, I'd get an electronic FoxPro call, but these are the ones I've had the most success with, with my low-budget air:
Talley Ho
The old style Johhny Stewart #7. These aren't made anymore and I am always looking for them. They aren't the PC-7 model they have now, but was pretty close to their PC-3 they have now.
The Verminator Tweety calls
Primos/Randy Anderson Ki-Yi: this one I am really likeing right now A LOT because it is so small and you can make lots of different sounds with it that carry a long way without much air. It was real windy here yesterday so the deer were not moving. I saw a yote 500 yards away running a fenceline and called him in with this call in 30 MPH winds to about 40 yards. No shot at that distance with my longbow in that wind!
Of all these, the easiest to use is the Ki-Yi IMO, the Verminator calls are the loudest and most long range, and the Talley Ho is the simplest and most reliable.