Re: RG1820xGK and pickups
you want versatility?
super 3 in the bridge
fred or air norton in the neck
i am assuming that you have a basswood rg due to the v7 and v8. the super 3 will cut and still have mad low end. the fred and air norton will have enough fatness, but not be too muddy for the neck. all of the pickups will sound great with the ibanez special 5 switching, too. really awesome clean tones.
for the duncan route... i would get an alnico 2 pro in the neck and the duncan custom or duncan distortion. the invader is a very mean pickup, just overbearing as far as bass goes. muds out if you down tune at all. lots of output, tho. the custom is more versatile, like a mean jb, and the distortion is more gain oriented. but the alnico 2...even the 59 is very versatile. i like the alnico 2 just a slight bit over the 59 because it is sweeter/smoother in the high mids. both split well, tho. really good single coil tones.