I've been using ASUS routers for multiple years and they have been bulletproof for me. Started out with a RT-N56U, then went to the RT-N66U and currently running a RT-AC68U.
RT-N66U is a great 802.11ABGN router and it has great support from ASUS as well as third-party firmware from Tomato, RMerlin's firmware (go to forums.smallnetbuilder.com for more info), DD-WRT and the like.
My RT-AC68 handles traffic for:
2 iPads
1 iPhone
1 Nexus 7
1 Galaxy Note 2
4 Tivos
3 smart TVs
1 Roku 3
1 Desktop PC
1 NAS
2 Xbox 360s
1 Xbox One
1 PS3
1 PS4
1 Wii U
1 Wii
Never had an issue with any speeds or multiple downloads going at once. Most of the devices are wired, though numerous wireless devices are going at any given time.
Regardless of whatever you get, make sure it has Gigabit Ethernet ports for both your LAN ports and WAN, so your wired devices will speak at full GigE speeds and you'll be able to handle a WAN connection faster than 100Mbps.
If you can spend the money on an 802.11AC wireless router, it'll be more future proof for devices that support 802.11AC wireless.