Apple 13" 128GB MacBook Air
Portability with excellent performance come together to make a great little ultrabook in this model from Apple. It has an Intel i5 processor that you can upgrade to an i7 CPU if you want even better performance. You get 4GB of DDR3 memory, which is probably this laptop's biggest weakness but you can upgrade to 8GB if you need your system to run faster. It has 256GB of Flash memory that you can also upgrade to 512GB if you want more storage which runs quite fast and should be good enough for most setups. The 13-inch display is pretty standard for a small ultrabook like this and it looks great, plus the laptop includes a backlit keyboard. This is definitely one of the slimmest and lightest options you will find, it being less than an inch in height when closed and weighing less than three pounds.