Batu or ipe hardwood are great, we did Batu 5/4x6 decking, 4x4 & 2x4 rails. Stain all sides before installation, then let it go grey. Pre drill & countersink the screw holes, use stainless screws, use joist tape on top of all joists & on any splits in the beams. Price it out - 100% worth any...