I use a reseller package from
Hawk Host - Shared, Reseller and Dedicated Web Hosting
They used to be called Devoted Host - I cant even remember a time when ive had downtime for longer than a minute or two, even then, those have been few and far between.
There support is often available via Live Chat and respond promptly to email. Overall, they are the best host ive ever used.
I do plan on switching to a VPS or Dedicated box(With Managemybox) at some point, but for a reseller package, Hawk Host ftw