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My wife has been wanting a meat grinder, and I have the KitchenAid so I'll probably go for that.  Kenji from Serious Eats recs keeping it in the freezer - have you done that?

YES!!!

It's not about keeping it in the freezer. It's about putting it in there before you use it. Same with the meat. Put the meat in the freezer a little while to get it VERY cold (but not frozen or it won't grind). The idea being that heat of the grind will partially melt the fat in the meat which you want to keep intact. So the colder that everything is (without being frozen solid), the better.

Ed Zachary.

It's not about keeping it in the freezer. It's about putting it in there before you use it. Same with the meat. Put the meat in the freezer a little while to get it VERY cold (but not frozen or it won't grind). The idea being that heat of the grind will partially melt the fat in the meat which you want to keep intact. So the colder that everything is (without being frozen solid), the better.

Yeah, I know the idea.  My issue is I don't have a dedicated freezer and the fridge unit is constantly filled, so not much space for appliances. 

Investing in a good chest-type deep freezer unit is a great idea, if you have the space.  Does a much better job at keeping things like... oh... sides of beef and such.

I had a chest freezer when the boys were still home. We no longer needed it, so I gave it to one of them.

I've had issues with chest freezers and fridges because I use them in an unintended way. For fridges, I use them for fermenting beer with an external temperature controller. It causes a lot of issues because it cycles the compressor too much. I used to use a chest freezer as my kegerator, but it ran into the same problem because I had to modify it to run at 40 degrees instead of sub-zero temps. And it was coupled with the fact that it was in a roasting hot garage during the summer rather than in an environmentally controlled house. 

So I've gone through a few. I now use a convertible fridge/freezer for the kegerator that is DESIGNED to run at fridge temps, and I bought that new instead of from Craigslist, so I expect that to last a while. I still use a fridge in the garage for fermenting, but those are cheap off craigslist until they die.

I've had issues with chest freezers and fridges because I use them in an unintended way. For fridges, I use them for fermenting beer with an external temperature controller. It causes a lot of issues because it cycles the compressor too much. I used to use a chest freezer as my kegerator, but it ran into the same problem because I had to modify it to run at 40 degrees instead of sub-zero temps. And it was coupled with the fact that it was in a roasting hot garage during the summer rather than in an environmentally controlled house.

So I've gone through a few. I now use a convertible fridge/freezer for the kegerator that is DESIGNED to run at fridge temps, and I bought that new instead of from Craigslist, so I expect that to last a while. I still use a fridge in the garage for fermenting, but those are cheap off craigslist until they die.

Get a Sub Zero.