In reply to Stone_donkey:
If you have feet that suit La Sportiva then try the Miura Lace. It's definately narrower than the Katana in the toe box and has a far superior heel. The Miura VS is a hybrid between the Katana and Miura in the toe box but has the Miura Lace heel, it is also slightly stiffer and agressive.
As others have said, 5.10 whites are also very narrow as are the Pontas (but the pontas pushes the big toe in towards the other toes quite severly!).
If you have long toes I don't find that any brand let's your toes bunch up as much as the La Sportiva Range.