Best Rangefinder for Hunting Under $800
Leica CRF 1600 Rangemaster: this is one of the fastest rangefinders on the market (0.3 seconds). It is very basic in operation making it very user friendly. You wont have to learn how to use it, just look through it and push the button as it does not have the unneeded features that the less expensive models have. The only feature that I would like to see them include is an angle compensator, mostly for bow hunting. Other than that, the plain Jane point and shoot ability is what impresses me most about the upper end rangefinders over the lower end models.
The Leica CRF is smaller than previous models from this manufacture, making it small enough to fit into a shirt pocket, while still being comfortable to hold and steady during use. It is 100% waterproof and made very well. The battery life is also notable, lasting up to twice as long as most other brands so you wont be let down when you need your rangefinder most. The optics in the more expensive rangefinders for hunting are much better than the others already discussed. Many people leave the binoculars in the truck and take only their rangefinder; not my choice, but very doable with the Leica or Swarovski brands.
Leica CRF 1600 Rangemaster Best price @ Amazon : $799