I dont know your budgets but I think you are really limiting yourself if you are looking for only IP cameras. I'd take it from a different angle and look at camcorders/prosumer HD (4k even) cameras. You get a LOT more functionality..
There are cameras like the Panasonic V750 or it's competitors..
http://www.bhphotovideo.com/c/product/1023343-REG/panasonic_hc_v750_full_hd_camcorder.html
That will shoot 120fps.
Get a little Black Magic encoder like this:
http://www.bhphotovideo.com/c/product/892453-REG/Blackmagic_Design_bdlkulsdzminrec_Ultrastudio_Mini_Recorder.html
a Macbook Pro and Wirecast free version that they license to youtube and you can give it a shot.
This video here is pretty much how we setup with some differences but it's a simple way to try this.
You can capture to disk and/or stream.
WIrecast has a full version trial that watermarks with audio and video watermarks but it is fully functional forever
We had GE in our video studio a couple years ago and they set up a circle of 28 or so Canon Dslrs shooting at 60fps which at the time was the best a DSLR would do. They shot this after posting it in Final Cut.
http://www.ge.com/thegeshow/solar/index.html#ch1
Let me know if you want some people to talk to that sell video gear, guys we deal with. Dont' worry , we don't overpay for anything here...We are frugal.