InMotion Hosting: East vs. West Hosting
During the InMotion Hosting signup process, they ask if you want to be East or West coast. Specifically, which coast you want to optimize for by locating your site(s) on servers proximal to one coast or the other.
Even though I am in relatively central US (MO), they recommended West and that is what I went with. Will keep you posted if I find any more specific info from them on server locations and responsiveness.