i used to own a greco,. then later own switched to yamaha,. then to fender,.
the tone was gorgeous man,....but when i tried ibanez,...i got stucked to it,.
fast neck,.... even for a 5 striing,.....
ibanez sounds fine. just that the GIO series doesnt sound good IMHO. lacks the body and warmth.. not to mention GROWL(only found and associated with warwicks or rockbasses)
i see your "choices" have not narrowed down since, but instead expanded lol!
i'd reccomend the MIJ fender. can't go wrong with those! but rmb that they're passive Jazz basses, it's really up to you to form your unique tone with your fingers.
the ibanez500 would be a great deal if u like the THUMP in your bass, highly reccomended.