I also prefer IPAs over dark ales. Dark beers are just too filling for me, but I do like them on rare occasions. The darkest I usually go for these days are reds or ambers. For a while I was even into wheat beers, however, I dropped that habit.
Next time, I'll have to feed some to my wife and see what she thinks. She isn't much of a beer drinker either, but I do give her the nicer ones to try sometimes.