Here's a bit of a conundrum..... I noticed last week that my American Express (UK) reward points buy less this year than they did last year. Accordingly, one of the the things I can spend them on is PC World vouchers in the UK. Now, I have enough points for approximately £600 worth of these and this would represent a very healthy discount on a new MacBook Air! The only issue I have is this: If I go into one of my local Apple store, I know automatically that I'm getting the latest/greatest revision of the product because that is all they sell. I suspect that shopping at PC World, I have no such guarantee. What should I be looking for? Any pointers would be very much appreciated. Also..... I know if I buy from my local Apple store, customisation is easy. If I want extra memory for example, do other (none Apple) retailers such as PC World support this?