I'm wanting to upgrade, and I move around a lot so I don't really like carrying a separate camera on me. I'm visiting LA, but I'm from overseas, so I'm looking for an unlocked one. It's $649 + 9% tax from the Apple store, or about $550-$600 from ebay if I'm lucky (saving me $100-$150). Is there any reason why I should opt to buy from Apple instead? Or is there a better alternative, like some reseller I am unaware of?