I have the Waring pro 450 watt model (big brother to the one mentioned above). I've used it to grind the trimmings from a few deer and last years moose plus countless geese. No issues with it whatsoever, it has even passed steel shot without a hickup as well as partially frozen meat. Replacement blades and plates are standard #8, available from many different sources ( I have swapped out my original carbon steel plates for stainless ones from LEM). Knives and plates do wear out, most manufactureres of decent grinders use standard sizes, make sure that any unit you consider takes a standard plate size (there are other standard sizes besides #8). When it comes to comparing HP to Watts, 746 Watts = 1 HP, ie my 450 watt model is 0.6 hp, the 300 watt model is 0.4 hp. If you are talking about doing the trim meat from 2-3 animals per year into burger or sausage, then either of the Waring units will probably do ( or something similar). If you are turning 2-3 entire animals into burger or sausage per year you may want something a bit bigger.
Jim