I think for my next nude or almost nude poetry reading, I'm going to go with one of my long time favorites - 'Israfel' by Edgar Allan Poe.
The last two verses always tear my heart:

"Yes, Heaven is thine; but this
   Is a world of sweets and sours;
   Our flowers are merely—flowers,   
And the shadow of thy perfect bliss
   Is the sunshine of ours.

If I could dwell
Where Israfel
   Hath dwelt, and he where I,
He might not sing so wildly well
   A mortal melody,
While a bolder note than this might swell   
   From my lyre within the sky."