Now that I figured out the problem I had with daisy-chaining two Airport Extreme routers (see the thread in this forum), I'd have to say that the AE is an extremely robust and good router; the new 5th gen Airport extreme has very strong dual-band wireless N throughput. I have been very pleased with it. Very reliable, and much better throughput than the Belkin I had. I also had the Cisco 4200, and that was not reliable at all.
Its downside: only 3 ethernet ports, but I just connect one of those to an 8 port switch and that works. That and there is no web admin interface, you do everything through the Airport Utility. If you are not a mac user, you'll need to install the software for it.
Don't know anything about Netgear (other than having one of their wireless to ethernet bridges for my Dish Vip 722).
You can easily extend the Airport Extreme with a $99 Airport Express; just plug it into a power outlet and you can add to your network -- plus it can feed speakers through Airplay. But the Express is a 2.4Ghz only router.