Also, you may want to look at tunneling WoW through SSH. When I was in Houston for a few months, there was a strange issue with SBC routing all over the country to get to the datacenter in LA - resulting in like 5000ms lag and disconnects every few minutes. I used a cheap VPS located in Los Angeles right next to the server and tunneled all the traffic through there, and boom, <200ms latency, no disconnects. I hear a lot of European players who use the US server use this method to reduce lag, as well as college students who have issues with WoW ports being blocked.

This is what I used:
http://eee.ericsson.ee/~odt/wow-tunnel.txt

To my knowledge, it is legal with Blizzard, according to my research and reading over the eula. If I'm incorrect: mods, feel free to inform me and delete this post