Want a professional router at consumer-grade price? Wired's wiki teaches you how to unlock your regular, old router's hidden potential.
The upgrades are as easy as installing a more advanced firmware on your router, and Wired walks you through the steps to do so.
Why would you want to? If you've been having trouble getting signal in some parts of your home, it will boost the signal power. You can also prioritize what should be getting the most bandwidth, and exercise a bit more control over your router's security.