1. Don’t buy a Hyosung. Their reliability has proven to be questionable and despite the warranties, the shops are unable to do repairs on them because they can’t get parts.
2. The choice between the SV650 and the ZZR600 all depends on whether or not you’re willing to sacrifice top end speed/horsepower for low-end torque. The SV also has cheaper suspension components. It DOES have advantages over the ZZR600 in the way of ergonomics and the fact that it uses a powerplant more clearly designed for “real world” riding and “real world” roads, but that’s all a matter of preference. Unless you plan on doing triple digit speeds regularly I’d personally go with the SV because it’s proven time and time again that on canyon roads it can keep up with, if not pass, 600cc supersports.