Greetings ! I'm setting up new surveillance and, at the moment, I'll be running 5x DS-2CD2T55FWD-I5 and 1x DS-2CD2742FWD-I cameras. In the future I'll be probably running 12-15 cameras all together (mostly these two models). Seller first recommended DS-7616NI-K2 but now he's insisting that DS-7616NI-I2 is better choice ? I'm wondering what you guys think. Is there even better choice in that price range and for my needs ? Thanks !