Beyerdynamic DT 1350: Split head band, they're very comfortable at work, they don't fall off when you look up, etc.
Sennheiser HD650 and HD800 here. While HD800 is more expensive/advanced but HD650 still is more neutral and preferable for some genres as rock/metal. I also tried HD 600 and strangely I love them not less than 650 and 800. Its frequency response is how music should sound as for my ears. I haven't buy them (yet?) because I already have 650/800.
Philips Fidelio X2.They combine the advantages of open headphones (which show up best with Grado cans IMO) with the ability to produce deep bass (missing with Grado cans).