I would disagree with the claim that they're not sweet. They can be (see: Duclaw's Sweet Baby Jesus), though "rich" is probably a more apt description.
I don't know if I'm just getting old or what, but my stomach can't handle those super-rich dark beers anymore, particularly the high ABV ones. They make me want to yak almost immediately.
I'm getting kind of bored with IPA's, too, since so many of them are virtually identical. The only way most guys seem to be able to distinguish themselves is by how much more hoppy they make the beer. I'm waiting for the day when "IPA" has morphed into a bottle of bathtub gin stuffed full of hops flowers.
I do like some of the pale ale variants - Dogfish Head's Pennsylvania Tuxedo is a particular favorite, though it's, unfortunately, seasonal.