Vyper...welcome to the forum. I think however you need to do a bit more research and reading about the Nexus 7 as well as read through this forum as your questions aren't really making sense. There is no hard drive and no '9 gig' version of the Nexus 7. The Nexus 7 comes in 16GB and 32GB versions and no, they can't be upgraded. You can with a little work transfer data and files on and off the device using a special OTG cable. As for viewing web pages, yes it's a great device to surf the web with. Also regarding streaming video, although there is no hdmi built in the new Android version that will be coming out soon does support Miracast technology for Wi-Fi streaming of video to Wi-Fi enabled tvs. Hope that answers some of your questions but again I'd suggest you take some time and read through the forum and perhaps visit the Nexus 7 website to learn more about it.
Best of luck,