The most conventional I would say are X-Metal/BIP. But I'm a finance manager by trade and have gotten away with X-Meta/1st Gen Rubies quite often. X-Metals is about having an edge I think and I like to show that off a bit. They look great with a suit and I'm told it's very military as it's almost a gun metal material and the Red lenses are similar to the finishes you have on a lot of gun scopes.
But yeah a funeral I'd def go X-Metal or Carbon/BIP.