Yay what fun!
#7-8 = hybrids of striata and maculata, or some mixed parentage with striata. looks almost like (striata x maculata) crossed with something else.
#27-29 = vaombe-ish (could be large)
#32,34,37-39 = hybrids of striata with a maculate aloe
The resemblance of several plants to Aloe striata is not accidental (pretty common and tough plant). There are 3 things which tip you off that they are not pure striata: (1) spots, (2) marginal teeth, (3) suckering behavior (which you will probably observe down the road with most of those plants). We have a lot of those types of hybrids growing around here and they tend to be really attractive plants with nice flowers, so I'm not at all down on the mixed parentage. Some of your plants look like only part hybrid, i.e. much more striata than maculata. The more striata-ish, the better the flowers in my experience.
Plants #3-4 are the ones that look most promising to me (or maybe I just like big chunky blue aloes).
