I listen to a lot of classical music as I am a musician (clarinetist) and I write a lot of music for trailers etc. . . IMO the best all round bud for the price point at this moment is PK2 and if you work on the computer writing music as I do, maybe a pair of PK3s. For about a year and half I struggled with Bose ie's while writing music. Every time I wrote and bounced the music to wav or mp3 I used pk2s or 3s and found that the music had a totally different sound stage and clarity that Bose just doesn't have (BTW Bose are not the most user friendly earbuds in the world either) I don't know if it's the sheer weight of the bud and housing or the design but they always find a way to come out of your ear.
To sum up - go with an inexpensive set of Yuin PK3s to start, if you like them upgrade to Pk2'S. For the money, I don't think you'll find anything better.