S. Drives are great summer tires. I wouldn't recommend driving them in the winter at all. They handle well in the rain though. I've personally ran them and I drive like a douche bag and I'm pleased with them. I would like to upgrade to something stickier though.
Which brings Khumo XS or Star Specs. Both are great tires and are supposed to be stickier than the S. Drivers with a slightly shorter life span. But remember a tires life is measured by the amount and type of driving you do. So a stickier tire could outlast a less stickier tire. I'm not sure if any of these tires are offered in 205/50 but start by shopping at
www.tirerack.com. They have REALLY good prices and a wide variety of tires.