I agree with you on the plastic. My Captivate, Galaxy S II, and Galaxy Nexus all were naked their whole lives with little more than a few imperceivable scuffs. My iPhone 5 was beat to hell in a matter of months. My 5s has had to be in (an admittedly lovely) leather case its whole life.The Galaxy S5 meets most of your criteria. The only thing it lacks out of those is the front-facing speakers. I know, some people would argue it also doesn't have a "durable body," since it's made out of plastic, but I 100% disagree. My S4 was tough as hell, despite being plastic (and I actually think partly because of it, since plastic flexes and also weighs less, so less impact force when falling). I've thrown it so many times, to the point the case came off and the battery flew out once, and it never so much as got a scratch that I saw. And the only reason I put a case on it was because it was too thin and felt weird in the hand, and the case I used was a very slim one, so it didn't add much to the phone, just a tiny bit of extra thickness and a better grip. As much as I dislike Samsung right now, the S5 would be my next phone if it were available unlocked with 32GB internal memory.
I'm not sure if the Galaxy S V is exactly what I'm looking for, but you're right it does meet most of those criteria.