Thanks for the replies
I posted this for a friend of mine that is not a 'computer person'. Me personally? I'm a teak, mahogany and white oak kinda guy. There were lots of great suggestions here. Don is rebuilding an older junk rigged wooden boat with lots of replacements being required.
I made notes of all of your suggestions and will see him today. Because his hull is teak, I am still going to suggest that he stick with that, pricey as it may be.
Ipe sounds like a good alternative for his decking.
I have worked with Bois'd'arc ( hedge apple, osage orange) and it will bring your tools down to their knees. I dont think his tools can handle it.
Iroko and just about any of the dense woods that come from the rain forests will work well.
As a comment to Breaking Wind, I think you are getting your red oak confused with something else. Red oak is generally much lighter than teak in weight and no where nearly as expensive. Red oak is one of the least expensive hardwoods running around $2.10/ board foot with teak running around $17/board foot. Red oak is one of the least durable woods for outdoor use. It generally starts to rot relatively quickly. White oak, on the other hand is heavy and 'fairly' durable for outdoor use. but still it is relatively inexpensive. "Old Ironsides" was built with white oak and cannon balls just bounced off her. Even when well varnished, it will blacken with mold over a period of time wherever there is water penetration. I use it for my belaying pins, but they are easy to remove and keep varnished or to just.
Thanks again for all of the suggestions. Don will appreciate it.
Tony B