How big is the site? I have rented a dedicated server with 100MBit unmetered and 1TB storage, 16GB ram and 2 xeon cpu's for under €100 a month; maybe it's better to look at such an option instead.
If you've such big site, you should avoid resource priced cloud and go with your own VPS. It might take you more time to set it up, but it will be definitely much cheaper ($50/month and less), and it can surely handle all your traffic until it grows really big....
Its source is the English language, so if there's a word or phrase that gets used, it has a result. Corpus linguistics is fun like that.