For those who are just starting out I recommend you get a reseller Hostgator account
because it allows to exceed bandwidth limits. Then on the launch data just watch your
bandwidth. If you feel like you are going close to your limit then chat live with Hostgator
and let them know. They will make sure you don't have any downtime. I have done it with them
before.

If you have videos and other big files then host them on another hosting account. But just for your
salespage and thank you pages this will do just fine. Of course if you are expecting huge surge of traffic
and have a lot of JVs where you know you will make over 100k in sales then you want to set up a dedicated
server.