Not kilt related (yet) but I need some help.

I'm about to put up a web site, and I'm trying to figure out what hosting I need. The site itself is about 200MG. The hosting I'm looking at has a 250GB transfer a month. By my calculations that would mean that I could have about 1250 people look at my entire site per month with out going over my transfer(which is way more that I ever expect). Is this right? I don't want to pay for more than I need, but am unsure how to figure all this out.

Adam