Used Grado SR60's. I'm not sure if they are SR60i's or the old SR60's as I've had them a while and got them from someone else.
The plastic screens and buttons have been removed and replaced with metal screens. I punched 4 holes in the drivers for increased bass. I dyed the HD414 pads black and I left the cheese cloth material on the drivers.
One problem you will note is some of the wiring is exposed at the Y-split. They've been that way for a while and it does not affect the sound at all. They work great and sound great.