List of Forum levels and unlocked features for each level?

Just curious if their is some place or some post somewhere that list how many comments are needed for each level up in the forum and what features unlock for each level. Couldn't find anything in a search. I'm currently at level 2 with 51 comments (52 with this post). I am looking for that point of being able to upload my own avatar but curious of what else is available along the way. From what I understand, personal avatar upload isn't until level 4 at 200 comments. This seems a bit high to me just to use your own avatar. In any case, I would like to know if their is a listing of when these levels and features unlock. Thanks.