I know this belongs in the audio forum, but before I jump over there (or before the mods move me), I thought I would ask my question here. Is there any difference between the 98-00 Lexus Premium system and the 01+ Premium System. I know both are made by Pioneer, that the 98-00 has only the ASL button, and that the 01+ version has 3 buttons (RDS, Traff and something else -- maybe ASL). Anyway, my question is whether there is any difference in terms of sound quality between the two head units. I have an opportunity to upgrade my 98 to an 01+ and I'm trying to figure out if it's worth it. Any thoughts would be appreciated. Thanks.

e-man