Hi Alternative, welcome to Jemsite!!!
Deciding on the 1570 is, in my opinion, a VERY wise choice, this is no entry level guitar by anyone's standards. As most people here on jemsite will tell you, the 550/570 series guitars are the quintessential professional players guitars (the 1570 is just the natural extension of the 5xx line) Everything about these guitars is geared toward the professional touring musician. They are VERY tough and dependable!!! These guitars are every true shredders gigging machine. They have the quality of the much higher priced Prestige's and the Jem's & JS
series..... without the price tag!!
As Linkage, Potato, and Tiger have said above. There ARE some setup techniques that you'll want to learn to do. This is actually necessary on any guitar, trem or hardtail, any brand. Setting up a guitar IS NOT DIFFICULT!!!! once you learn the process, it will last you the rest of your life. You could absolutely use RedTiger's advise and allow a local tech to do the majority of the work if you like, but unless that tech is willing to come to every show, gig, practice session that you go to.... you better learn it....... strings always seem to break at the worst possible moment......lol
The Edge Zero, in my opinion, is every bit as solid and dependable as the Edge-Pro, and even the Lo-Pro and original Edge (and thats saying a lot!!) You just have to know how to set it up!!
Like Linkage said, Go to Rich Harris' site: http://ibanezrules.com/
Rich is an everyday Senior member here, and arguably the single most informed person in the stated on Ibanez guitars past and present. He's actually the only dealer in the states that I know you can trust implicitly. I would also go as far as to say that if your serious about buying, I would call or email Rich first!! His prices are unbeatable especially when you consider the level of service he provides before, during, and long after the sale. The guitar will be delivered to you completely inspected (and he finds stuff none of us ever could), setup to your preferences, and stage ready!!!!
Best of luck whatever you decide. Remember to post an NGD thread when you buy it.