Wow - a can o' worms Marc. There are a plethora of dedicated server farms out there for hire, but I don't think that it's an easy thing to pre-judge the level of real support you ARE going to pay for and receive prior to giving them a go. Whirlpool and other forums are just so full of opinion that it's hard to tell what's real advice and what's not.
Are you prepared to provide your own hardware? I use GlobalSwitch in Sydney (Glebe), that's an incredibly secure (and SLA-guaranteed) hosting facility where I telehouse 5 of my servers. I have access (after a training period - lots of protocols and OH&S rubbish) to my own hardware when I need it, but there is no "help" as such. If you want that, then there are plenty of outsourced host support companies such as
http://www.touchsupport.com/ that can do what want - i.e. support you, but at a price. No-one just adds support for free these days. In fact, hosting (perse) and support don't go hand-in-hand any more. They are each a saleable item.
Have you approached either GlobalSwich or Fujitsu (two of the biggest and most secure by far) to see if they offer direct support?