I don't read many mainstream fiction writers regularly. One of the few I do is Sarah Addison Allen, and that's because she writes magical realism. If you're not familiar with the genre, it's similar to old-school urban fantasy (like de Lint), but with the fantasy or magical element made far more subtle. Books like these seek to elevate you above the ordinary with beautiful language. On the other hand, fantasy also wants to transport to a different world, but it takes a more literal approach. Depending on the subgenre, the style may be elevated for high fantasy or straightforward for modern urban fantasy. Patricia McKillip excels at combining a poetic writing style with a sense of wonder, and I would say Bujold does as well.
Do you have a preference for beautiful words or wonderful ideas? I'm sure many people will say they want both, but do you think one is more critical than the other? Which authors do you think do words, ideas, or both well?