I've done 4 trips on the West Buttress in the last 2 years. The Olympus Mons might be the most popular boot on the mountain. As long as you get the fit right for your feet they are a great boot for that route. You could even call them overkill if you have generally warm feet.
Personally, I've used the La Sportiva Bruntse and found them more then warm enough. I've summited with overboots and without, just depends on the exact weather of the day and how fast your moving.
If you have the money get a modern double boot. Yes, we all used to climb these mountains in plastic boots (and were even happy about it at the time) but there is a reason they are disappearing from the market place. The comfort of these newer boots is outstanding and no more shin bang! Your feet take a beating on Denali so getting the best boots for you is money well spent.
You can use vapor barrier socks to add some warmth but personally I hate the things. I just use a thin liner and a thicker wool sock. Bring two sets for the lower mountain so that you can rotate socks ever day and they will dry just fine in your sleeping bag. No need to put them on your belly. I just throw the things in the bottom of my sleeping bag and after two nights they are always fully dried out. I also bring a third set that I keep in a zip-lock and save for summit day so that I have a fresh set that isn't covered in dry sweat. Not a bad idea to bring a thin set of dedicated sleeping socks too.
4 pairs of socks might sound like a lot to some people but the West Buttress is not fast and light alpinism. It's expedition mountaineering. Take care of your feet, bring the Gold-Bond. Get yourself to 14,000' camp happy and healthy. You can then cut weight and get your suffering in for the move to high camp and summit day.