from what i heard the i580 has great reception and it has a different battery than the other nextel phones. BTW both phones have mp3 players. the 580 is basically the 870 just ruggedized and with PTX (push-to-manager).
as for the i880 i read its supposedly coming out in the fall around oct./nov. but im kinda skeptical about that b/c we have very little info on it as of now, although it could be possible.
