what you have to consider is the feel. you like the s series, so where is the problem? change the pickups and you're set to go...

besides, you already have an RG, so you have got the whole, bass-wood, 24fret sound covered...so why not try a 22 fret mahogany guitar? it will atleast give you some variety.

I'd go with the s series (not only is it sexy, but I cant stand 24fret guitars).