500ms seems a little high, never used Netpass though. Maybe try 27net.net, you can try it for free. I played from shanghai using this vpn and had no major issues playing at around 200-300ms most of the time(stable in 25man raids). Just takes some time to find a few servers that works well for you.
Dealing with ping issues is something you better get ready to deal with if you don't wanna play on chinese servers. For me personally it was annoying at the beginning (going from 23ms to 230ms), but once you get used to it, it's fine. I'd go with 27net.net as a vpn choice caus when netpass sucks, there's nothing you can do ; with 27net you can still try other servers, hoping for a better ping.
When you log on a realm type "/join english
" to get in touch with the community members.
WoW English/Chinese glossary
(2000+ translated words) found on wow-in-chinese.jfs-web.chEnglish speakers are consolidating on the same realm for Cataclysm check this thread