I read some of the huntorials and started with the newbie section. In one of the posts, it suggested that a lot of people start their suit with the bio. I found a bio that I really liked on ebay. After reading on through some other threads, I saw that not all bios fit all masks. So I don't start off on the wrong foot, which head will fit this bio? I'm completely new to this, so some help would be much appreciated. Thanks.