Any Lovecraft aficionados among us? What book should I try next?
-- WB
Oh, dear... that's a question and a half! I think everyone who likes HPL's work at all has their favorites that they think would be the best place to start. I'm of a somewhat different bent these days, and would tend to suggest to begin at the beginning... but a lot of people find his early work less captivating than his later tales, so that may not be best either.
I would suggest, however, not making
At the Mountains of Madness your first choice -- not because it's not a good tale (it is one of his best) but because it can be a tough slog for someone not used to his work. (Then again, it was one of the first I read, so go figure....) Ditto
The Dream-Quest of Unknown Kadath -- a wonderful (if flawed) tale, but hardly typical, and also of a type rather less popular with most readers (though by no means all).
On the whole, the Penguin Modern Classics editions of his tales are the best currently in print for a fairly low price; and out of those, I think I'd suggest
The Call of Cthulhu and Other Weird Tales, as it has a larger selection of his best work, or (despite the caveats above)
The Thing on the Doorstep and Other Weird Tales as it features two of his three novels, and
The Case of Charles Dexter Ward (novel) is certainly one of his greatest achievements in many ways.