he space you're buying from us has to cover everything that you want to do; mailboxes, web pages, databases, e-mail lists, and so on. So you'll need to make sure that you purchase enough space to cover everything. Not only that, once you have such a versatile web hosting arrangement, you'll find lots of other uses for it, so don't forget to cater for the future.
Of course, it's very easy (and cheap) to purchase additional webspace, but if this happens after the initial purchase, it will also incur a service call.