Constance here.
For cherry tomatoes, you can't beat Sweet 100. They're a pain in the butt to pick, mainly because you'll eat as many as you pick, but they are so sweet. One plant will give you plenty. It's an indeterminate plant, which means it will bear a long time, but the plant will need support. One plant is probably all you'll need. These are also good for oven-drying.
Roma is the standard for canning, roasting and making sauce. It's also one of the most dependable. Even in a bad year, you can count on it to produce. There are some new hybrid Romas on the market now that are larger. I usually plant 4 of these. If you are canning, you could double the amount.
I have several favorite slicing tomatoes. The absolute best-tasting tomato I've ever had is the Brandywine, an old heirloom. A bite of a Brandywine, still warm from the garden, must be a lot like heaven. But they are late, have no disease resistance, and only bear a short time. I wouldn't plant more than one.
Burpee's Big Beef, Park's Whopper, and Supersonic are dependable slicers. All have great flavor, disease resistance, nice size and smooth skin.
For a pink tomato, I'd recommend German pink or Burpee Pink Girl.
If you want a yellow one, the old-fashioned Golden Jubilee is still the best choice.
Georgia Streak is a wonderfully sweet, pink and gold beefsteak type that I recommend growing if you have the extra space.
All of these tomatoes require staking, except for Roma, and even those will benefit. The best way to do this is to get 5' wide concrete re-inforcement wire from your lumberyard...they will probably even cut it into the lengths you need. This type of wire has big enough spaces between wires to stick your hand through and pick the tomatoes.
The cages need to be about 3 ft. in diameter...sorry, don't know what the circumference would be.
With your wire cutters, cut free the horizontal wire on the bottom row, leaving the vertical wires to stick into the ground. On the side where you have free horizontal wires sticking out, use pliars to fasten those wires to the other side, forming a circular cage.
While these cages do take room to store (actually, we just leave ours in the ground till spring), they last for years, and are just the right size. Those little wire cages you find at the discount stores aren't good for much of anything.. they won't even do a decent job of supporting pepper plants.