I'm quite fond of Lunsford & Connors The St. Martin's Handbook, which I got for under $5 when the newer edition came out. There aren't a lot of things I look up for myself, but when I'm doing critique and trying to explain why something is wrong, it's a great reference for finding the correct names of what comes to me more or less naturally.

Oh, look, there are copies available for three cents! http://www.amazon.com/gp/offer-listi...condition=used

Maryn, who knows a bargain when she sees one