Hah! A topic I have a lot of experience with. I grind a couple hundred pounds of meat a year or more from deer, moose, elk, pork, buffalo and beef and have retired a lot of grinders over the years!
Whatever you do ...
do not buy the Waring Pro or Cuisinart brands from retailers like Canadian Tire or other mass merchants...They are fisher price toys at best. You will strip auger drives in minutes with very little throughput capacity and no reverse option. I wasted a lot of money here on these brands and although customer service is very good at getting you parts ... the units are not capable of doing much at all.
If you already own one.... The KitchenAid Mixer has a grinder attachment available that works very well but not much for capacity... if its only 20lbs you grind once a year spend a hundred bucks for the grinder attachment and you wont be disappointed.
If you are on a budget or want best value for your $$$ look at CTR's High Caliber Grinder
GRINDER, PLASTIC 1000W 110v
Price is $195
High Caliber Grinder for the Hobbyist! 1 KW Motor has capacity for about 20 lbs in 10 mins. c/w Fine, Medium & Coarse Plates, Stomper & Stuffer...
I personally use this one with no issues and believe they misrepresented the capacity.... i do about 20 lbs in 5 minutes. Best value for the dollar I have found so far. Its drive is oversized and wont strip on you . Looking at the Cabelas and Bass Pro Shops models they look very similar. Cant say i have had many problems with sinew plugging it up either but sharp blades and cold meat keep that issue down too.
No question I miss the big industrial units we used growing up but I also don't see a $1000 bill for these heavy haulers to grind a couple hundred lbs of burger a year as value for my money.
You do get what you pay for...so shop around