Hello Paul,
I have answered your questions below:-
1. DotNetNuke is fully supported?
Ans: Yes
2. I get a full blown SQL Server DB, and not SQL Express?
Ans: Yes, you will MSSQL 2005 Enterprise edition.
3. I can host DNN at the root of my site e.g
Website Hosting - Mysite.com
Ans: Yes.
4. I have full access to manage file/directory permissions myself?
Ans: Yes
5. I can upgrade from Copper to Platinum at any time
Ans: Yes
6. I can multiple domain pointing at the site without using a redirect e.g. mysite.com and mysite.co.uk and NOT mysite.com redirecting to mysite.co.uk
Ans: Yes
We offer Dotnetpanel on our Windows shared hosting packages.
Please feel free to post if you have any questions.