I have two Linksys WRT54GS wireless routers and they perform flawlessly. (The 'S' indicates the router has Speedbooster capability which gives it up to 35% greater throughput when your computer has a Speedbooster compatible wireless modem, otherwise it's basically the same as the WRT54G).

I had problems running the wizard from the CD (as mtndew06 mentioned) so I installed it manually.