Better yet, back it up a level... why do you need a dedicated server, rather than cloud hosting? Dedicated servers go strongly against industry trends.
Cloud is popular because it is cheap. For consumers and providers. If you know exactly the resources you'll need and have infrastructure in place to scale then sure, VPS/cloud hosting might be good if you're looking to cut costs.
In the end though, you'll always be sharing and limited. If you're approve dynamic allocation then you'll just be paying for it at a premium.
When you find your business decisions going against the herd, you should really ask yourself WHY you're going against the herd, because our herd is pretty smart. That doesn't mean you should never go against, just that you should make sure you're thinking it through.