Ilona wrote:

We are at the moment thinking of adding a new all time list. Maybe most wins, most streaks, most ladder points ever? What are your ideas? What would you like to see as factor?

something on the lines of the ELO system:

The Elo system was invented as an improved chess rating system and is also used in many other games. It is also used as a rating system for multiplayer competition in a number of video games,[1] and has been adapted to team sports including association football, American college football, basketball, Major League Baseball, and eSports.

The difference in the ratings between two players serves as a predictor of the outcome of a match. Two players with equal ratings who play against each other are expected to score an equal number of wins. A player whose rating is 100 points greater than his or her opponent's is expected to score 64%; if the difference is 200 points, then the expected score for the stronger player is 76%.[2]

A number represents a player's Elo rating and increases or decreases based upon the outcome of games between rated players. After every game, the winning player takes points from the losing one. The difference between the ratings of the winner and loser determines the total number of points gained or lost after a game. In a series of games between a high-rated player and a low-rated player, the high-rated player is expected to score more wins. If the high-rated player wins, then only a few rating points will be taken from the low-rated player whereas if the lower rated player scores an upset win, then many rating points will be transferred. The lower rated player will also gain a few points from the higher rated player in the event of a draw. The rating system thus is self-correcting. A player whose rating is too low should, in the long run, do better than the rating system predicts and thereby gain rating points until the rating reflects his or her true playing strength.

This system would actually keep it fair for everyone regardless of what level they are playing at... it ranks solely on skill with very little room for error

more info here:

http://en.wikipedia.org/wiki/Elo_rating_system