Honestly it's pretty hard to make that much traffic to your site. The site my brother bought has I believe a 100GB traffic limit per month, and has 5gb disk space. The cost was under $150 for having the space and the domain name.
Id say go for what you want the site to be, and see how the traffic goes. The more traffic, id say to look at different possible solutions.
btw, its under $150 for paying everything for the year. :-)
