Looking to buy a 15" Laptop

Looking to spend around $800-$900 for the laptop. Bought this laptop here but finding the 13" screen to be too small.

http://www.microsoftstore.com/store/msc ... .314247000

Looking to get a 1920x1080 screen, i5 or higher processor, number pad on side, hopefully not too heavy and decent battery life if I do take it out of the house.

Any recommendations for laptops?

Have these 3 laptops in mind right now:

Lenovo Thinkpad E550 - $704 (upgraded to 5th gen i5 and high res screen)
http://shop.lenovo.com/ibmeppfriendca/c ... ries/e550/

Lenovo Flex 3 - $920 model
http://shop.lenovo.com/ibmeppfriendca/c ... -customize

Dell Inspiron 15 7000 Series Touch - Don't think it has number pad on side
http://www.dell.com/ca/p/inspiron-15-75 ... 548-laptop