Re: Ibanez RG 2550E
yes- the Super Wizard neck of the RG550 was the thinnest Ibanez has to offer, it's discontinued WEF 2005.
i'm indifferent towards the Dimarzio IBZ pickups in my SA2020, as long as they sound good with my amp (they currently do), they are for keeps.
i nearly bought the 2550, in fact. but since i was gonna swap the pickups to Duncan + i like the maple fretboard better, i bought the 1550 instead.