I would grind with it first, than build a table. I tend to grind a bit higher than most, typically between my sternum and belly button. Everyone seems to have an ideal height for different things, and nothing about it seems typical in nature. If your building a do it all solid table for other work as well, I would build to suit so it is comfortable with all different types of work intended. You can always shim the grinder up, but would be difficult doing every other process with a table high up in the air.
With a herniated disc in the back I like to change from sitting to standing quite a bit, so I bought a motorized adjustable drafting table(had a thread on it when I got it), but not everyone is going to have that availability or necessity. Some guys use a bar stool for this type of thing but I actively try to keep proper posture while working and can't do that with my feet dangling and hangin on to whichever object is closest to them.
My .02 cents,
Justin