The GTS4 isn't really much a safer car just cause it's 4WD. It behaves like a RWD until it oversteers. Most people sh*t their pants and lift off the throttle as soon as it's oversteering, thus the front wheels don't engage at all.
Buy the R32. From experience, things WILL go wrong. Yes they are an endless money pit so be prepared for it. You don't want to live your life just paying for a car and that's it. In the end you'll end up cursing it. It's meant to be enjoyed.