I have a first Gen. Nighthawk, had it for a couple years. It is wonderful. I can't speak of the newest Nighthawk, my coworker has one about 8 months old. No problems at all. I have 19 things on my home network at all times, and even get wifi signal at the end of my block, about 300 feet away on my cell. For modem I have a Motorola Surfboard Xtreme SB6121, which off the top of my head don't know what the current model is, but look into Motorola. Check out Newegg, they got the best prices and gear. Also you might want to look into Asus, they make a top notch router.
I am a long time computer geek, here is my current rig I built a couple years ago and still going strong.
AMD 8150 FX A.K.A Bulldozer 3.6Ghz 8 Core stock
Asus 990FX Sabertooth Motherboard
16G G.Skill Sniper RAM DDR3 PC1866
HIS IceyQ 6995 Video Card X's 2 in Crossfire
Mushkin 128G SSD for operating systems, Mushkin 500G SSD for the overflow
Cougar 1200 watt power supply.
All liquid cooled. Could go into the specs but too much to type.