Actually, with a rider as strong as the OP, it makes more sense to get a fairly weak chain instead. Then the chain could be sort of a sacrificial fuse that would break instead of bending cranks and stripping nipples out of rims and the such. Better to replace a chain than to have to deal with the systemic damage 400w will do to the rest of a bike. I knew a guy once who was such a strong rider he would saw halfway through the pedal axle so that it would break first. Otherwise he was kinking frames all the time with his power.

jim