150gigs should be fine, even if you watch a movie every week and game 24/7. I think Reach and Black Ops take anywhere from ~15-30mb per hour depending on the games youre playing, obviously more in a 14+ player game with everyone talking constantly. If youre on the PC its pretty easy to monitor bandwidth usage though.
Movies are around what, 5-7gigs for DVD quality(720p). Not sure about Bluerays 1080p. Ive never used Netflix so Idk if it just downloads the entire DVD, menus and all, or you stream the main movie(can cut the size of the file down to near half if you get rid of all the extras and unneeded language packs).
Maybe someone can start an online petition for MS or Sony to provide a bandwidth usage monitor for consoles or something, since this would be the time for them to do it.
this is how things are generally done elsewhere. your not alone. gameplay bandwidth is negligible voip is higher and we recommend a 2gb dsl service for our customers knowing full well they wont even get close to it. the only people hurt by this are pirates.
in Auatralia, passing the cap imposes speed restrictions on your connection from 25Mb down to 64Kb
3 people in this house play online, and well easily use 10-15gigs a month on JUST video gaming. Especially MMOs sometimes with their 1-2gig patches every few months. Not to mention most console DLC hovers in the 500mb-1.5gig range. And as previously mentioned, many people purchase games digitally over Steam. 2gigs a month is for people who only web browse and use messengers.