Sennheiser HD25 and HD250II. Ideal for tracking, best isolation ever, great sound.
IMHO the best choices for tracking when near-perfect bleeding isolation is a must (who wants to hear the whole backing track again in his/her $$$ vocal condenser mic?)
I admit though the SOny 900 is very nice too.
Not fond of BeyerDynamic though. Wear them for more than 15 minutes and you got a headache (not very comfy).