LinkSys, a popular company specializing in router and other internet devices, has always been up to spec with producing high quality routers. For the longest time, their WRT54G wireless router has sold extremely well due to low price and its ability to be hacked for increased functionality. The WRT54G has a huge fanbase, with people constantly writing new Linux firmware for the router. Hacking the firmware can make this router perform and have the same abilities as a 600 router as stated by Wi-Fi Planet here. Increases in operating range, using the router as a bridge or extender.
LinkSys has recently announced that they will embrace this community by releasing an upgraded version of this router dubbed the WRT54GL. The L version, L standing for Linux, comes with a Linux firmware preinstalled. Get your WRT54GL at Amazon.