Hello, I'm sorry if this has been asked many times before, but there is a lot of conflicting information on the web, so I'd appreciate it if someone would help me with this. I'm visiting the US soon and I want to buy an ultimate Macbook Air 13" from a retail Apple store. The specs I want are 4GB RAM, 2.13GHz CPU and 256GB flash storage. I found several posts on this forum confirming that retail stores carry ultimate configurations, but I phoned the store in San Francisco and they said they only carried base configurations. I also tried to reserve a Macbook Air online via Apple's website, but again, I could only find base configurations. Was the person who answered my phone call clueless? Is it not possible to reserve an ultimate Macbook Air 13" online? Thanks.