Sorry I'm coming to this thread a little late.
I used Sitefinity for Goondocks.com for several months. Overall, I was happy with the service I received. There are certainly some setup issues, but it looks like you've battled through most of those already.
The other issue you might encounter is DiscountASP.net recycling (restarting) your web application during non-use. If you web site gets light use, it gets unloaded from memory. The "start-up" costs associated with reloading your application can result in slow load times.
To prevent this I used DiscountASP.net's control-panel to schedule an automated request to my web site every 15 minutes. This prevented my web site from being recycled.
I wrote a bit more about this topic at the following URL:http://goondocks.com/blog/07-10-26/Preventing_Slooooow_Sitefinity_Startups.aspx
If you discover any other tips please let us know!