A router is something I feel you can't spend too much money on. I mean, whatever you're paying to the ISP, if you have a shitty router you're not getting the full use of it. You're basically overpaying the ISP for MB/s you don't use.
Anyways, one week later and my
ASUS RT-AC66U is performing like a fucking BOSS. The first day, it was disconnecting randomly, and I was afraid I might have to get a new third-party modem. But after that first day it's been fucking awesome.
I have a 50 Mbps plan with Comcast and I always thought that was shitty, but no lie I'm streaming 1080p YouTube shit left and right and it's not even breaking a sweat.

Like I go to the video page, hit fullscreen and it auto-selects it and there's NO BUFFERING. Also, my biggest issue pre-new router of random disconnects at 1am+ are completely gone too.
Combined with my Chromecast I honestly feel confident in getting rid of my Blu-ray player soon. I won't, because The Social Network and Girl with the Dragon Tattoo are stunning, but it's still tempting.
Anyways, yeah, I believe there's few things you can buy for yourself that are worth investing in more than your router (another would be your mattress.) I couldn't be happier with my RT-AC66U and it's pretty damned future proof too - dual band, 802.11AC, Gigabit.
In fact, this router's made me want Google Fiber significantly less. THAT should tell you how much of an improvement a new router can make.