I just got an Asus RT-87u. Fast and stable as hell. The best part is that I got it for over $100 off as an open box from a seller on Amazon.
I hardwired my PS4 since my Fatboy PS3's wireless was so trash. I use a powerline adapter from my router to the PS4 in the other room.
As for your modem, depending on who you're with, you can save a little on that too. I was looking as a 6141 since i have a 6120, but wound up getting a Zoom 5341J modem since it had good reviews, was cheaper and was compatible with my cable company. The combo is very stable and I havent had a dropout or restart since I plugged them in a month ago.