Multi-author short story anthologies tend to be a mixed bag, by definition. However, I've yet to be disappointed by The Best American Short Stories series.
For the 2007 edition, guest editor Stephen King and series editor Heidi Pitlor assembled a solid, diverse (not in the PC-sense of that word, but in its correct, original meaning) collection.
"Toga Party" by John Barth, is an unforgettable story about an older couple contemplating mortality in the midst of a celebration.
The late William Gay's "Where Will You Go When Your Skin Cannot Contain You?" is a story of love gone wrong, with the drug epidemic of the rural American South as a backdrop. This story is worth the price of the entire collection, in my opinion.
And there are many, many more gems here. Highly recommended.