Hi Phil,
Thanks for the beer! Much appreciated.
I would go with Standard, it is the full product with all the textures and backgrounds etc.
As far as export, you want to export as HTML and then follow the steps in this document to make a mojoPortal skin.
http://www.mojoportal.com/creating-skins-from-artisteer-html-templates.aspx
If you have troubles with the conversion we'll try to help. It is actually going to be even a little easier after Artisteer ships version 3.0 and we ship the next version of mojoPortal and both are coming soon. Artisteer 3.0 will be a free upgrade to anyone who bought it in the last year.
Best,
Joe