Hey all I have two questions

1. What resolution should I change movies off itunes and amazon mp4's to to work the best on the Nexus 7
I know the screen is 1280 X 800.. do I want to use that resolution for the actual movies?

2.So I recently bought a hd movie from the playstore which I'm able to watch in HD on my Galaxy Nexus and Nexus 7.. However when I tried to watch it on my computer (through the playstore website) I noticed it would only display at 480p..

Does anyone know if you can watch HD movies from the playstore on your computer? Or is it just HD on android devices..?

Sorry I didn't know which forum to post this

Thank you