I have Yokohama Avid Ascend GTs on my 15. I have 195/55R16s and I don't want to go any wider than that.
My experience with them has been very positive. They have more than enough lateral grip for autocross and tearing up back roads, but are still solid feeling in the frequent rainstorms of the east coast. And while we don't get that much snow where I am, it handles that well enough as well.