A collection is an invitation. A collection makes available a variety of poets and gives us choices. If one poet doesn't work for us, we can go on to another. Occasionally we discover a poem and find ourselves saying, "Is that poetry? I love that."
The Norton Anthology of Poetry by 
The Poets Laureate Anthology by 
The Norton Anthology of English Literature v.1 by 
The Norton Anthology of English Literature v. 2 by 
The Making of a Poem: a Norton anthology of poetic forms by 
A Book of Luminous Things by 
The Art of the Sonnet by 