Thinking about getting an N2 off contract (for AT&T). The cheapest I'm finding is $650 either directly from AT&T or from Amazon. I can save $50 in sales tax buying from Amazon, and from what I see Amazon has a better return policy (30 days, can't find mention of a restocking fee vs AT&t's 14 days and something like a $25 restocking). I've always bought my other phones in person at BB or the AT&T store. So what downside am I missing buying from Amazon instead?