W. H. Auden has always been one of my favourite modern poets, and the 'Selected Poems' one of my favourite volumes of his work. While he gained popular vogue for a time following Ben Elton's film 'Four Weddings and a Funeral' (still one of the funniest films ever made), the full extent of Auden's ability is attested to in this volume, which includes some of his best loved and well recognised poems (and does not include 'Funeral Blues', the poem from 'Four Weddings' - if you're looking for that poem, try the short volume 'Tell Me the Truth About Love'). This selection by Edward Mendelson includes the original versions of poems edited by Auden later in his life, also giving a unique perspective on the early development of Auden's work.
Poetry is, of course, a very personal taste, and one man's favourite poem is another's jumble of ill-chosen words. That being said, it is difficult, to my mind, to find poems written in this century which surpass 'Oxford', 'Musée des Beaux Arts', 'In Memory of W. B. Yeats', 'Et in Arcadia Ego'...the list is practically as long as the table of contents. No matter the subject (even to something as curious as 'In Praise of Limestone'), Auden has words for us, words which are as powerful, as moving now as they were the day they were put to paper.
In short, if you are at all tempted by poetry, this volume is certainly worth your time.