netmeg - 6:33 pm on Mar 2, 2013 (gmt 0)
I have (or control) a lot of sites between my own and my clients; many on shared hosting, some on dedicated IPs (usually because of SSL), a few on dedicated servers. All in the US. Some interlinked, some not. I haven't seen negative or positive effects that I could pin on hosting.
HOWEVER I have used (and rejected) maybe six or seven hosting companies in the past four years; things that matter most to me are security (the mega-cheap shared hosting plans are very prone to issues) performance (some hosts just cannot deal with platforms such as WordPress or Magento efficiently) and customer service - which may not directly affect SEO, but it sure makes a difference when something goes wrong.
I think the main things you need to worry about nowadays are security and performance; the items you listed are probably of minimal importance to a healthy site/business. Of course, if you are straddling a line because of other issues, maybe hosting issues could push you over, I dunno.