get the 570/1570. remove the middle pickup if it annoys you that much, but it's no contest. In my opinion.
Much better solution... on the pickup selector switch, swap the hot wires for the neck pickup with the middle pickup. This way your bridge will remain your bridge, the next position which is normally bridge and middle will be bridge and neck, the middle will be the neck, the 2nd from the left will be the neck and middle and the left will be the middle... you only lose the bridge and middle together which is my least favorite pickup combination....
I would definitely pick a 550/570/770/1550/1570/2550/2470 over a RG42* in a heartbeat.
I'm setting up a RG 2570 for my mother's boyfriend right now.. the action is incredibly low and it has the great thin Ibanez RG neck.... I'd so like to keep that guitar!
....but be sure to go with some good BKPs in it whatever you do... or at least some Dimarzios or something else....the stock pickups are pretty bad.... I'm trying the Joe Satriani set in this one...