Hi, I think it might not be a good match - mainly because surfing on the IT is a lot different than on a PC. WIth the PC everything usually works, the screen is big, easy to use, etc. The N800 (in my opinion) is more for a techie person who doesn't mind the quirks and is just happy to have some internet access, or to check email, etc. Its not so great web surfing compared to a PC because the screen is small and sometimes had to click or select a link. Also, what if it got buggy and the browser kept quitting, or a major site like Facebook didn't really work. It could be frustrating. Just my 2 cents.
Maybe the teen could see it work in a store first?
Also, you do have wi-fi access at home? or where will you use this? good luck.