Pretty sure we use Beastnode, though as far as I know it was the zombie plan because when the server first came out it had a fair amount of players. The plan can probably be lowered though, but my main concern is hard disk space. Even with the zombie plan($30/mo) it was only 5GB of space provided. This is very little when you have a lot of players exploring the world. The world itself was 2gb, meaning we couldn't have any automated backup services and sometimes we had to manually clean stuff out to keep the file sizes down.