Macbook Air 13.3 2014 vs Surface pro 3 vs Lenovo yoga 2 pro?

I'm confused between 3 devices for school next year. The MacBook air 13.2'' 2014, Lenovo yoga pro 3 and surface pro 3. All of them are light, but the aesthetics of the device are important to me also. I like the surface pro 3 because of the pen and onenote integration, the Lenovo because the specs, motion control and versatility but the aesthetics are a bit off. The MacBook air is the latest trend and it looks good, but it doesn't have a touchscreen for a pen input. Help me which one is good for school that has pen input, looks good (mainly aluminum, magnesium devices look good), light and has good specs because I have IT at school and I need a spec heavy laptop for programming and testing games. I can't choose which device shall i get, the price range can't go higher than AUD 3,000.