NSFisher....
Indeed, welcome.
I have no experience personally with the alumisol but I have heard others comment favorably on it. Do-It offers the Crystal Clear AND the Essential plastics. I am very familiar with both of these and would suggest you look at the Essential as a cross-over plastic for a couple of reasons. First is the heat tolerance it possesses. Second is the clarity with very, very few bubbles. The noticeable lack of odor while cooking as compared to all other plastics is yet another plus on its behalf. The Essential is the most forgiving plastic I have used and I have used quite a few. As your talents in using the plastic get more advanced, the Crystal Clear is the direction that I would shift to, but that Essential is really an excellent plastic to begin with or to move to gain experience. The Crystal Clear comes in three great firmnesses, the Essential only in medium; however, you can soften or harden the Essential product using those components you already have on hand.