I'm going to go with +60

A guy who went from a +45 to +60 on 17x9's on s2ki swears that his car handled a lot better with the +60 offset.

While +48 would look better with more camber, I'm more concerned about performance than I am about looks. Having said that, being lowered and 9 inch wide tyres bring good looks as a bonus

Also, another guy on s2ki is running the same wheels and is sitting a little lower than I plan on going and he says he only rubs a tiny bit on the guard liner when he's on full lock.