Yoga 3 Pro vs HP Spectre X360 vs Toshiba Kirabook i7?

I want to buy a nice looking and but also a little powerful notebook for general office work (mail, surf online, excel and stuff). I went to the store and they recommended these 3 products. Which one would you recommend? Price is almost the same only Kira is a little expensive compared to others.

HP Spectre 13-X360 = intel core i5-5200u, 8 GB RAM, 256 GB SSD, 13.3" 1920 x 1080 screen, intel hd graphics 5500

Lenovo Yoga 3 Pro 80HE00JRTX = Core M (1.2 ghz) , 8 GB DDR3 RAM, 256 GB SSD, 13.3" 3200 x 1080 screen, onboard graphics card

Toshiba Kira-107 = Intel Core i7 5500U, 8 GB DDR3 RAM, 256 GB SSD, 13.3" 2560 x 1440 screen, Intel HD Graphics

Toshiba Kira-107 would be my choice - but with a 15.6 inch screen