I have heard of a lot of folks like Tom Lewis, that used a square wheel a lot, but I am in the camp that it totally depends on price. There are a lot of nice options out there for good 2x72 grinders. If you can acquire a decent motor and a VFD, which there is a lot of info available on those parts--you can end up in a 2x72 variable speed grinder pretty reasonably. That would be my goal for sure--I started with a really good 1x42 belt sander, a Burr King 562 but it was single speed and it was a huge jump forward when I got my first 2x72. (I've got 2 now and the Burr King is now variable speed.) Good luck to you however you go!