I can answer some of those questions, but not all...
You should be fine with peach and pina colada flavors. Neither are generally known to be tank-crackers. A there may have been a few issues with certain brands, but they are usually fine. As for cinnamon, I believe the cinnamon candy (red hot) flavors have more problems with that than the natural cinnamon flavors. You should be fine with a bakery-type cinnamon flavor, like cinnamon rolls or something, if that is what you are looking for. One thing to watch out for with cinnamon flavors is that it is often hard to get the flavor out of a tank/carto/clearo. You might want to consider having a second one, just for that. Plus, its always good to have a back up if something suddenly goes wrong with your main. If you do want to experiment with the known tank-cracker flavors, a cheap and simple way to do it is to buy some cartos. They generally have a metal sleeve, and it's only the acrylic and polycarbonate tanks and clearos that are problematic.
edited to add: This is a great thread on the juices that may crack tanks:
http://www.e-cigarette-forum.com/fo...ices-flavors-crack-tanks-ce2s-clearos-33.html
And as far as what tank you want to get, that depends a lot on what you are using now, and how you feel about it. There are as many opinions on this as there are stars in the sky!