I would also keep in mind what level you want to run. Either way if you choose 1 or 0 I would go with a 7200RPM hard drive. They way I do it when I need more space is I buy 7200RPM drives so that once I upgrade I can always use the drives I replace for something else.
<font color=red>People and hard drives are like bandwagon fans and sports!</font color=red>