Considering 700P, have a few questions. Please help.

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I'm considering buying the 700P but have a few questions. I'm not terribly savy when it comes to all the smartphone features, I currently have the A900. I've spent about an hour in the Sprint store and at least 2 hours on the phone with Sprint and can't seem to get a few simple questions answered.

They advertise a package with Sprint TV Plus, but can't tell me what chanells I can view. Also, are they full streaming TV like a normal TV or is it just short clips?

The other thing I'm VERY interested in is using it to listen to my Sirius Radio. Can I access and listen to Sirius on the 700P? If so, do I do it just like as if I was accessing from a computer...go to sirius.com then "listen now", or is there a better way?

What is "OnDemand?" That's another selling point that they weren't able to describe to me.

Lastly, with the unlimited internet access package, is the phone just online all the time?

Thanks!!!!!

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EDIT - I saw on the Sprint site that you can get a whopping 20 Sirius chanells through their plan. But, I want to get access to all of them. Is that possible to listen to all sirius through Treo?