I love grados as well, however had to get rid of them years ago for one issue, they are efficient, great sound, and really top to bottom "Realism in sound"
However due to the open back they are as loud as a Clock radio going off in the next room.
I have needed to go to sealed backs in the past, some of sonys top of the line studios are nearly as good as grados, more costly in some cases...
I am currently considering the new top of the line KOSS, they look killer and have the spec's to match, I have had great luck with Koss in the past, they are pretty well priced as well up to about 150 bucks street price... They have a very high impedance so they can be driven by virtually any headphone amp or in some cases maybe even a cheap CD player with volume control from the RCA's out.
Anybody used the KOSS here? I think they are the MV1's...They would seem to do it all.