CTS Pots are great, Alphas are great too, Emerson makes some expensive ones I haven't used -but since they think their 18 dollars caps are better than a 2 dollar orange drop I'm guessing they'll try and make luxury out of anything -I guarantee their pots are not worth it. Dimarzio used to make great ones -but I think CTS or Alpha probably made them for them Go for the CTS or Alpha IMO.
an Ibanez RG will need 500k Pots
The post on your current pots is likely 1/4" (6.35mm) -check it -that's what your nobs will want to reattached to -if not they are likely 6mm
all check the pot shaft to see if it's a solid or split shaft. you'll want the same kind in your new pots.
You can buy them from StewMac.com