[Ghoulish Delight]

I've found Netgear to be the most consistent brand. But you'll find proponents for just about any one on the market, so ymmv.

Installation and setup is usually pretty straight forward. The trickiest part is that you'll want to add security. That will consist of configuring an 'encryption key' on the router (a long string of letters and numbers). Then you'll have to enter that same key on each device that you want to connect into the wireless network. Most routers come with step-by-step instructions on how to do this on the router side, and the Wii/DS have simple interfaces for doing it on that side.