Picture # 7: I also think this looks like Oreocereus trollii.

#8 Maybe Stetsonia coryne, and in the background, an echinofossulocactus?

First one looks like something I picked up and the suggested ID was Melocactus

Third might be magnimamma?

Last one looks like Stetsonia coryne.

With that said, since I have a bunch of plants with no ID you should wait for ideas from those who know more than I do. But I figure ther is no harm in me sharing my thoughts.

Amy,
Congrats on the new plants. #1 does look like a Melocactus, don't know the species, #2 looks more like Parodia schumanniana ssp. claviceps, #3 does look like M. magnimamma, #4 I think you hit right on the head with Mammillaria huitzilopochtli, #5 could be O trollii, it is an Oreocereus and I agree with the others on #6, Stetsonia coryne. This should give you a good start to do some searches with.
Dan
Lincoln, NE USDA 5

Thanks for the help, all, I think we've got them properly named now. I shoulda known most of them but the names will come back to me in time. I guess that's why they say "use it or lose it"!
Amy