Re: 7vwh - rg3120 or what else?
All the Prestige RGs and the JEMs have the same locking trem being the Edge Pro. It's a good trem system. Pickups can be replaced on any of the guitars, so really it should come down to feel and personal preference if you can afford any of those guitars. I do like the fact that the 7vwh is made of Alder because it's a very nice tonewood but I also really like mahogany. The only wood that I'm not super satisfied with is basswood because it doesn't really have a lot of character. You really need to just play these guitars because the necks on them, for me, would be the big deciding factor if I could afford them all. Personally (even though I think the JEM is a bit overpriced) I would probably go with the JEM and just change out the pickups to something that I like better solely because it has the most comfortable neck profile of any guitar I've ever played...there, I said it.