I just found a Pickering model PH-4955 in my parents' house, and did a little research. I got a few results with a google search, among them this ad:
These are behemoth cans, and they have a seashell effect when they're not plugged into anything (lol!), but suprisingly, they don't sound half bad when compared to the HD650. I might put an ad up for them, what do y'all think?