Agreed about One Touch of Venus, and I am also a fan of its sister show Lady in the Dark (an American Kurt Weill musical written during World War II that was a star vehicle that has a wonderful score but doesn't exactly hold up all that well without a major star).
I also like Mack and Mabel, Dear World, The Gay Life, Happy Hunting, Irma La Douce, Lost in the Stars, Take Me Along, Wildcat, Little Me, Sunny, Sally, and Very Warm for May