If you just study in the office and don't need a graphics card, it's more convenient to buy an ultrabook: Lenovo U4 10-IFI 14 inch ultrabook (i5-33 17U 4G 500G 24G solid state drive 1G Bluetooth camera Win7).

Use Thinkpad if you want to make a business model, and use ThinkPad if you are authorized.

ThinkPad X220i (4286-A56)12.5-inch notebook computer (i3-2370M 2G 500G Bluetooth fingerprint Win7)

ThinkPad E430 (3254-A54)14 inch notebook computer (i5-3210m4g750gg610m1g independent Bluetooth camera)

You can also look at the parallel X230, which is quite good.