Now that I've selected the new system I am going to buy when I get my fat legal settlement in ten days (Rega Brio amp, Rega DAC-R, Spendor A4 speakers, and optionally the OPPO UDP-205 if I can find one at a good price), the last item I will want is a good set of headphones. I've been using a set of Bose over-ear phones (don't laugh) for too many years and it's time to upgrade.
I want the over-ear design with comfy ear pads and closed ports. And lightweight because I'll be using them on the go 80% of the time and occasionally at home when I don't want to disturb the housemates or for certain kinds of music. I am looking to spend in the $400-600 range. I suppose Sennheiser and Grado are the classic audiophile headphone brands, but what other makes and models should I consider? I had my eyes on the OPPO PM-3 till I found out they're sold out and hard to find (like their UDP-205).
So what would you buy, given my budget and preferences?