GREENVILLE, S.C. — At $50,400, you can hardly tout the Boxster as an every-man's Porsche, but it's about as close as you are going to come. Porsche took advantage of Boxster's total makeover last year to not only tweak the performance elements, but to sharpen the styling and upgrade the cabin. In other words, Boxster is still the entry-level Porsche; but you will be hard pressed to find anyone, who has driven the new Boxster, call it that.