Which TP link router should i get ?

Hello, I am wondering if i should get TP link n750, n600, or ultimate wireless n gigabit router for my apartment (1 living room and 1 bedroom). Please give me some advice. My family plays ps3 wirely, and use mac book and iphones wirelessly. We usually stream tv show on netflix though, so i am not too sure which router i should get since the connection of my old D-link router is no longer stable.