Yes they will plug directly into your ipod, also you change the cushions by swaping them out (they slip right on/off). I have yet to hear the sound difference with the (G) cushion, I have (L) cushions wich are stock on the MS2i's, so I cant comment on them. The (S) cushions that come with the SR80's are comfortable even though they are on ear. I highly recommend the SR80i's, you will not be dissapointed. In the future I'm going to purchase (G) cushions, around ear, for my own experience.
I've been watching several reviews for the SR80i's and I'm almost sold, I really love the look and I really love everything I hear about it from everyone on this site and on the reviews and these will be my first(besides the skullcandys i own atm) set of headphones, but my only concern is, if I buy the L cushions, do they go around my ear??