The ms1i's are probably a great choice.  They are probably going to be a great all around set of cans for you.  I've had to eq the AD700s to enjoy most of the rock I listen to.  I'm considering a second pair of phones for that music.

I'd go with the AD-700s.  I now own the AD-700s  and several years ago owned a pair of Grado SR60s.  I primarily use the AD-700 for orchestral and chamber music.  I have Dallas Symphony season tickets, and the sound I get from the AD-700 is remarkably similar to the live sound I hear.  I would...

Thanks to some help from this forum, I've just gotten a pair of Audio Technica AD-700s to listen to at work on my laptop.  The sound from the jack on my PC isn't bad, but I have a Beringer UCA202 that I'm using right now as a DAC/amplifier.  (Already had the UCA202 and could stand to get it back...