I've been canning for many years now, mostly tomatoes, pickles and jam. Personally, I wouldn't use anything but canning jars made for that purpose. Canning takes a lot of time and effort, and to have your product go bad because you used the wrong jars would be a real bummer.
I make tomato sauce and can it - if you decide to do that, be prepared for a really long, hot day. I usually start in the morning (around 9) and finish around 11 at night. That's because you have all the prep time, the simmering, then the water bath. But it sure is worth it when you open the jar in February! Commercial sauce can't touch it.
One thing that is really easy to do, and I recommend, is to can a quart or two of whole or stewed tomatoes each night. That way it is manageable, and uses your tomatoes at their peak. When I do whole (peeled) or stewed, I include a tablespoon of bottled lemon juice and a teaspoon of kosher salt in each quart. Doesn't effect the taste, and helps with the preservation. (BTW, we usually have about 25 plants, so I have a lot of opportunities to can

.)
Good luck with your canning. I have found it to be highly rewarding (and I never thought I'd be the type to can). There's a book out there that I got a few years ago called "American Country Living Canning and Preserving" by Linda Ferrari. Don't know if it's still available, but it has a lot of good technical tips plus good recipies.