If your looking for a great quality rg with black and maple, I'd say bump up to an rg550. You can get used ones for fantastic prices since the black body versions are the most abundant.
It will have much better construction, and if you get original v1 and v2 pickups, they just scream. The v7 and 8, not so much but world's better then the infinity or quantum they use on their cheaper lines.
Here's a pic of my 1990 I just restored.
If however your looking for something new..
I would say that the 300 series is not worth it, and the 400 series is a bit better of a value in that range for new.
Personally any Ibanez branded tremolo that isn't an original edge or a edge pro, isn't really worth having.
Newer ones sound thin, and wear out faster imo.
Better to have an original Floyd or a Gotoh dropped in.
The only interesting feature on their newer trem is the trem stop, but you sacrifice Alot for it and can easily have that back with a Tremol-No for 50 bucks, and it isn't an intrusive swap. Works with standard trem claw swap with no new holes needed.
I'm going to install one on mine shortly.