I liked reading all these :)
I have quite a few 'favourites', it's hard to pick one.
Still I Rise - Maya Angelou.
Journey of the Magi - T.S. Eliot. (Although I like Eliot in general).
Ode to Autumn - John Keats. (We did Keats at school and I was the only one who liked him, but I just think it's beautiful).
Adolescence - Nin Andrews. (It's not really a poem poem, it's a 'prose poem' but I like it a lot).
Also, Stevie Smith in general. Everyone knows the Not Waving But Drowning one, but her other stuff is great too.