Depends on what kind of riding your planning on doing most - If your gonna go touring, you should get the Connie ! Its a plain bike, but, with 6k miles on it, its not evern broken in yet ! Load of folks get well in the 100k miles sans problems !
As for the others -
Z1000 - fun bike, crap stock suspension - if yo uget one plan on new springs at least, if not new shock, spring,s and gettin the stuff to match the adjustments , and fork valving . Once yo udo that, the thing rides on rails ! Great bike on those issues are worked out.
ZRX - BIG bike, yeah its heavy, but, its a BIG bike !