For those of us getting the 3G model (which seems like almost everyone on here nowadays)... Will you be activating your AT&T usage right away? Do you plan on using 3G every month or only using it once in a while? And which plan? 250 MB or Unlimited? -- I'm thinking I'll activate it within the first few days and will probably go for the unlimited, all the time. I'm pretty sure I'll be using more than 250 MB on a regular basis but we'll see how things go after the first month!