I was thinking that the reputation limit would be fixed (somewhere around 60?), mabye with more than one cutoff limit (40, 50 & 60?). That way, the number of good nodes available in the list would increase over time and not get "stagnant" with the top N all time greats, and not too many nodes' reputations could be given away (not that the reputations would be listed - just that it would be difficult to figure them out).