I started out with a Craftsman 2x42" grinder, and over about a year or so it was heavily modified. The cheap motor was the first to go after it burnt up, then after I tried to grind the end of my thumb off between the front belt/wheel-shroud, that was cut off. The platen also required stiffing. Not to mention the belts wore out quikly.
After I got my Coote it took a little while to get used to it but I am very well pleased and would have been money ahead to get it to start with.
I considered the Grizly, but I had a 1 horse motor already and liked the idea of step pullies to chang spees. Also the Coote has a slightly stiffer frame. Also although I'm not a big fan of hollow grinding I can hollow grind on the Coote without bumping into the motor.
I recently bought a small wheel for the Coote, around 50$US, for gaurdwork. It's the new wheel with external ball bearing instead of needle bearings like the old small wheel. Not shure if Grizly makes a small wheel or not. Changing to the small wheel takes a few minits, but is a lot faster to grind the inside curve of the gaurd than my old way.
If I had it to do over again, I'd probly just save my money for a KMG. I plan on getting one eventauly, and useing the Coote for small wheel and slack grinding.
Whatever grinder you get, if you ever do up grade you will still have a place for it.
BTW, not trying to nock Grizly, it was very close, but the Coote suited my purpass a little better.
Good luck