Lots of people are saying negative things about offering an i7 in the MBA's.
yet reading the IB reviews , it says they are considerably cooler and faster. Its a no brainer if you get an i7 model to get the 8gb with it. Another well known website said that the myth that getting hotter and more powerful shorten life is a pants claim. Why:
I5 at full power for 60 seconds = heat for longer
i7 at full power doing full job 35 seconds = less heat
BUT
same battery usage.
Myths indeed about i7 chips in MBA's , i think it's more that 8gb of ram with i7 and new SSD in a 11inch machine is pretty wicked bit of kit!
Even if it does shorten life, the machine is covered for 3 years for tech support, and your going to buy a new one in 3 years anyway are you not? lol