I want to build a simple bench for a custom shower. I priced out Teak and
found it to be very expensive and the stock more limited than other species
(at that lumber yard at least).

I found African Mahogany and Philippine Mahogany at a reasonable price (1/3
of Teak). Are these woods acceptable substitutes for Teak in a steamy wet
environment. What other species can you recommend. What finish do you
recommend for Mahogany? Linseed oil or a polyurethane or something else.

Thanks in advance