the closest thing to a non sig maj 7 is an ibanez S5527/6527 - weight, ergo, neck, trem or hardtail, without the messy electronics
Personally if the electronics is the only issue I would get a JP7 non piezo
rg1570 mirage with edge pros are some of the coolest base prestige models, in good shape yes to trade
if the rg is beat up and in a lame color I would pass
if they are actual dimarzios maybe
realistically to most people its worth less than an original rg7620 with stock finish thats in good shape which is around 700 or less reasonably
The newest iteration of every cheaper headless company has gotten better, goc is decent but the neck is fat, if you like thinner ibanez types try legator
numbers dont tell the story
set the trem flat and the top and bottom strings usually sit a bit higher than the middle strings
3rd and 4th strings will start to buzz first
edge feels better, stays in tune better if you lock the nut, but can't get quite as low action as adjustable saddle guitars unless you individually shim the saddles which is a pain.
in time most things sell unless its very overpriced or obscure
I see use limited stuff sell over retail, some people get what they want and dont care about the price
those specs arent that special anymore, its in MIJ ibanez territory with SS frets, worse trem, more "metal" pickups, likely worse neck/fret work, I'd take the better trem and fretwork any day