Re: ibanez RG/JEM vs. charvel model
All of those guitars play wonderfully, as ever this kind of question comes down to personal preference but here's my 2c: super wizards are my favourite necks, and some RGs have those. Jems are fantastic all-rounders with thin, comfortable necks and I'm a Vai fanboy. Charvels play just as well as any other brand you care to mention, but I don't like original floyd roses.
My list of preferences would be as follows: J Custom RG > Jem > RG > Charvel
Caveat: if any of the ibbys in question have a bridge other than an Edge, or Lo Pro, I'd opt for the Charvel.