Arguably the best road going sports coupé on sale today just got better with the launch of the R version of Porsche's Cayman at the LA Auto Show.It gets the four-wheel drive bodyshell but only two-wheel drive running gear.Holding center stage on its expansive display at the 2010 LA Auto Show, the 2012 Porsche Cayman R made its world debut to become the lightest, hottest and undoubtedly coolest