most cars now days are all metrick i work for cadillac and i have nothing but metric in my tool but but eventually bought some standard because we get used vehicles to work on. so for the most part the only manufacture that i can think of that uses standard is Ford and thats older Fords, Ford has pretty much changed over to metric.

just buy a basic set of standard scokets, wrenches just in case u ever run across a vehicle wit standard size bolts on it.