I have the LEM big bite .75 hp grinder, went with it because it will run all of the attachments ( possible future purchases) love it! I have tried cheap models and even the kitchenaide grinder attachment. From my experience the better the grinder the lower time spent grinding but the more you want to grind. I find myself making sausage , brauts and salami more and more.
Maybe go in with hunting buddies and share the grinder. I know of a few groups that do a group grind after the hunt. Just hanging out drinking beer and grinding their game. Of course a cheaper grinder means more time and more beers

. You will not regret buying a better grinder but that cannot be said about a cheap one.