I just bought a bunch of Cumaru, which is around 20% of the cost of teak, is harder, and looks almost exactly like Teak. It can be found at almost any decking store. The stuff is fantastic in appearance, and several friends have used it for years now and absolutely love it for exterior marine
You can get 1x6 pretty easily, or go to the boardwalk at Atlantic City and pull up what you need. JK, on that, I talked to one of the engineers who worked on that project
and he highly recommended the Cumaru.
Presently I am building new dorade boxes out of Cumaru, and they are looking nice.