I think the mid-range Ibanez shredders that you're considering are a great value. One small note I'd add is that many, perhaps all, the comments about the Edge Zero II bridge seeming stiff are really about the ZPS (zero point system) that's included with it. I know I'm not alone in immediately removing that from any Ibanez that has it. It's basically a tensioner that stiffens the trem system. In theory it helps it return to pitch, and maybe it does, but in practice it's just something you have to fight when you want to be expressive with the trem. You can easily remove it or later put it back in. Without the ZPS unit, the Edge Zero II feels much like any other Floyd-style trem--it's fantastic! I had an RG1070 with the Edge Zero II for a while, and still have an S1070 with it, and I think it's an outstanding trem system.
I know this is heresy on here, but I'd take it over the original Edge (which I've had on several guitars) for its low profile, easier hex access when string changing, and (at least on the two I've had) screw-in rather than pop-in arm assembly. I really don't like those Ibanez pop-in arms, the bushings wear down and they never seem to stay adjusted the way I'd want for very long--always either too tight, too loose, squeaking, or whatever. A good pop-in assembly, like on Gotoh bridges, is the best, but a screw-in arm at least lasts longer than those annoying bushings and can be adjusted to what you'd like. In fairness, though, I think I've read that the original Edge is made of higher-quality materials, and it may itself be more durable, so if you own this a long time and play it often the Edge Zero II may need replacing or upgrading in the long run. Others could speak to that better than I could.