My client is a startup and he needs a world-class website on some of the best hosting providers in the world. Page loads should be fast, we can't have servers not responding and going slow, support must be great (like a Live Chat or similar SOS system), and everything else like custom apps should be supported. Any "Unlimited plans" would give us fewer headaches.
I've heard of Engine Yard, Blue Host and Dream Host but I want to know the ground realities instead of simply reading reviews. Do you have any experience? What would you host on if you wanted a world-class datacenter behind you?