Thank you guys for all of your replies. I will go for a Nexus 6. As of Nexus 6P, it's almost 2x more expensive than Nexus 6. With 300$ for Nexus 6, it would already be overpay after selling my Nexus 4 and 7. The bigger screen of 6 compared to 5 is an advantage as I want to "replace" my tablet...