Excellent choice, I must say!
Reining, cutting, working cow - that's my line of work. :)
It's amazing watching those horses work. The relationship one builds with their horse while working and training is just unbelievable. These horses just go go go and you never see a cue from the rider.
And there's nothing that quite excites me like seeing a horse slide on it's butt for 30 feet. :)
As said before, I would definitely suggest taking some lessons with a trainer at their place to get a feel for it before you jump right in.
I'm taking my sister to the Red Deer Supreme this coming fall. I don't know if you've heard of it or not, but it's a big reining, working cow, and cutting show - and boy do you see some amazing horses in that ring!
If you're available (it's a three day event), feel free to come along with us. :)