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I wouldn't worry about adding the Pleco. If you can grow your angels to 6" in that size tank, you might be the first. Angels need hundreds of gallons of water to reach full size. I house mine in 120 gallons, and I know they will never grow that large.
I happen to be an advocate for the snails. Several were introduced into my tank on plants and they seem to help keep things clean and add a certain uniqueness to the aquarium. If their population gets out of control, the introduction of a loach will fix the problem.
With regard to the number of angels kept, my experience has been to keep groups of them (> 6) or two. Angels will pair up, and they will become territorial if they have a reason to be.
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