We host a majority of our client sites via racks of dedicated servers at MaximumAsp, a top tier hosting facility. MaximumAsp is truly one of the better ISP facilities on the planet. They offer the security and infrastructure expertise, and we add the hosting and DotNetNuke expertise.
But we don't stop there.
What we also include (that others hosts don't without additional cost) is timely testing and updating of the DotNetNuke core as updates are available, as well as testing and updating of custom modules.
It's a win-win for both of us when we keep sites to the current stable version of DotNetNuke. They are more stable and responsive, but also easier to manage and maintain.