A friend was looking to replace her wireless router, and I suggested a refurbished AirPort Extreme. New units sell for around US$180, but refurbished models from Apple are $130. Still, that's significantly more expensive than the average Linksys router you'll find at Walmart or Best Buy. Is it worth it?
There's no scientific answer to that question, and reasonable people can disagree, but I will share my experiences and my decisions. First, I don't claim that my knowledge is exhaustive of all makes and models. I have used several Linksys models (including some with DD-WRT), a few Netgear models, and a few Belkin ones. I have also used AirPort Extreme units since the days when