Depends on what skid you are running. If you are going M10 then CR is def the way to go. Get it unfinished like others have said. If you are going with another skid I like Van Amberg or the Power Addiction. All have similar running boards now. The early CR boards did get a ton of snow stuck but they are all similar now from what I have seen.
Chad makes a great tunnel from CR racing but the van amburg will run you almost 700-1000 less depending on accessories. If you do go with powdercoating for any tunnel I would shy away from powdercoating the running boards. Just have the tunnel powdercoated. After 2 years you will be happy you stuck with a natural finish for the running boards!