This is a list of compatible routers. If you have any that I missed please post.
LINKSYS Worst. If you even get your Wii to run on one it's extremly slow and lags. Update time: 35-50 min.
D-LINK OK. Works OK with Wii. Will ocasionally lag and has slower update times. Update time: 10-20 min.
NETGEAR Great. Works extremelly well with Wii. Almost No Lag. Fast update times. Update time 2-5 min.
I have a NETGEAR Wireless MIMO it is awsome. My updates take about 2-3 min. It took me 1 minute 45 secs to get the News Channel. I thought this list would help.