Look, I have serious violinist/collector friends who Love Hillary Hahn. Rave about her. It's just my taste. I would start with the Szigeti Bach's, there is a Biddulph with a selection of his works, Bach, Bartok, Brahms, and something else, it's a good start. Check out his Brahms Concerto recordings- incredible. And his Mozart Sonatas with Szell and Horszowski is my favorite recording of just about anything. It restores my faith in art and music. He is kind of the polar opposite of Heifetz (who I love). Kind of Ying to Heifetz' Yang. Or another great recording of his is the Recital at the Library of Congress with Bela Bartok at the piano, Beethoven Kreutzer, Bartok Rhapsody, Debussy Sonata, nad Bartok sonata. You'll realize that Bartok was one of the genius pianists of this century. It sounds like a great jazz colaboration. There is a philip's japanese cd pressing of the bach's. bad sound, and he was a little past his prime- which you can hear on a biddulph short pieces album. But the monumental artistry is obvious.
Check out the Bach of Menuhin's youth, it is delicious. I'm a fan, so I also appreciate his admittedly more funky and earthy(read slightly out of tune and shaky) later Bach performances. I actually prefer them, in the same way I prefer bruised, browned overly ripe peaches that when you bite in to them, the overly sweet juices run all over and it is a complete mess, but the flavor is divine.
Not to beat a dead horse, but to me Hillary Hahn, is like a very good, perfectly round, flawless, firm peach, with good color,not quite ripened yet, peach that you buy at a gourmet produce store.