I am not a service provider, neither do I have a direct experience with these guys, but they have been commercially present in HostingDiscussion for a very long time, which to me spells stability: PlatinumServerManagement.com
Most support companies that I come across usually have outsourced personnel. These guys seem to be completely US-based ⏤ a big deal.
That's just my 2 cents. I'll let other, more experienced members, put in their own recommendations.
Their ad here on the forum: