I can't improve on Rosemaries ID's. Identification of these comes down to experience more than anything else. Rosemarie and I grow many of the plants you ask about. These genus' freely hybridize, and there are a great many plants out there with no name at all. Start by looking at Desert-Tropicals.com. Have a look at hybrids at Echeverias in Oz. You may have to accept the fact that some will never have a proper name. Be sparing with watering 'Amethorum'. Those magnificent overly-plump leaves have a tendency to split. Nice bunch of plants. Happy growing! Brad

Pot size lets us determine the approximate size of the rosettes. Yes, that does make a difference. Try searching for Sempervivum calcareum. I misspelled the name the first time. A google image search for Echeveria elegans produces lots of pics that look like your plant. Sorry for the misspelled name :(

E. prolifica would be my guess.

I know what you mean. I had been thinking about your 2 plants numbered 8 and 9 in the pics. I have a couple that I rescued without labels, that I distinctly remembered cutting off the stem to root. One had an offset that looked nothing like the parent plants I beheaded, thought I must have mixed something up or was going bananas. First clue was posting here for possible ID. Someone said it looked like a graptopetalum....no I said, it came off of an echeveria...then I started to doubt myself. In looking at pics and noticing the names, I came across a graptoveria. Derp! Ha ha on me :D