Unless you like polishing, I seriously recommend stainless.
You never have to polish it. Just wipe the water spots off. I think they're pretty close in price too.
http://jetboat.homestead.com/files/untitled.jpg
Yup same price for aluminum or stainless from Rex $129
part numbers
182-160 aluminum tall
182-300 stainless
Rex scoops (http://www.rexmar.com/page194.html)