Finally think it's time I found out what the Grado sound is like. I've been using a little PA2V2 amp that has given good results with Koss Porta-Pro's and my old iPod. Have also been satisfied with the Koss's directly into a BlackBerry playing Slacker.
Don't know to go with the 60i that is good straight out of players or the 80i that really needs an amp to sound it's best (so I've heard). There is also a strong likelihood they will be used with a Little Dot I+ and iPod or BB.