One of the big differences between the tormek t-7 and the grizzly 10" is the quality of the stone. Not wanting to say anything bad about the grizzly stone, I'll just say that the tormek stones are really good.
The other thing you should check on the grizzly is the duty cycle. If you plan any serious sharpening sessions, this could be important to you. The T-7 can run for many hours straight with no issues. The tormek t-3 only has a 30 minute duty cycle. Running it longer than that risks ending up with a warped machine housing. The grizzly is a tormeck knock-off. Is the grizzly 10" built like the T-7 or the T-3 (or a T-0 :biggrin

? Will it make any difference to you? If you spend a couple minutes sharpening a day it probably won't. If you have your turning club over and have 10 guys using the thing it might.
The standard Tormek stone (SG-250) will work fine on M2 HSS and carbon steel, but it does not stand up to the newer powder metal / cryo steels. It runs about $180.
The tormek black silicon wheel (SB-250) works great on every kind of steel I've used it on. Stuff that would quickly wear a groove in the standard wheel doesn't leave a mark on the black wheel. The black wheel also will supposedly touch up carbide tooling, but I've not tried that. It runs about $200. It's been money well spent for me.
Buying a T-7 and then buying the black wheel will give you the best sharpening solution (in my opinion anyway). But it's a pricey solution. If the grizzly machine meets your needs, then one of those with the tormek black wheel could be a much more economical, but comparable solution.
Ed