1. Langston Hughes
2. Emily Dickinson
3. Robert Frost
4. Walt Whitman
5. E.E. Cummings
6. Sylvia Plath
7. Maya Angelou
8. Dylan Thomas
9. Shel Silverstein
10. William Carlos Williams via
I've heard of all of them
I've read one or more poems by all of them (I think; I'm not entirely sure about the last one) and I'm sure I have at least one poem by each in the house (courtesy of some massive anthologies).
Most of them are fine, in small doses.
I own more than one volume of two of them.
Favorite? Shel Silvestein, by a long shot.