Re: Which Ibanez model is this?
They're not bad - pretty beefy sounding, with typical compression of a high output pup. The single coil mode is indeed hot enough to use in isolation and it keeps up, I use it this way quite a bit actually. The RG600 has active pups. There's actually a 530 like in the op on eBay right now for $350 bin.
Yes, in 1986, the RG moniker appeared for the first time, though the guitars were still Roadstars. I don't know that they'll become collectable, they're just not that sought after compared to the Jem derived RGs (most people don't care for the butter knife headstock, notched horns, trem that doesn't pull up), but they have important shredder DNA for what came later.
I like them though - neck shapes in particular are a winner for me.