My suggestion would be don't buy new. Wait for a decent used set at like half price. You can probably get a set of much better tires at 70% thread for $400 than you ever would have new for $600.
1998 BMW 328is - summer
1993 BMW 525i - daily
1994 BMW 325i - sold
1992 BMW 325i - gone
1988 Mercedes Benz 190E 2.3-8V - sold