unfortunately all the values you see online are more than likely way off compared to your league. There are too many factors that play in effect to get accurate pricing the meets your league's settings. Roster sizes, starting positions, flex positions if available, and what type of bench spots are permitted, will all skew your values. Below is a formula I found a couple of years back in the cafe (third post down). I used one year and what I found out (other than it took me sometime to do) is the even though I had the correct valuation of the players, everyone else still used the cookie cutter sheets you download online and the market prices were based off those prices (and were significant higher). Bottom line is that YOUR league will establish those prices no matter what any sheet tells you. http://www.fantasyfootballcafe.com/forums/viewtopic.php?f=1&t=327448&p=3213554&hilit=auction+formula#p3213554
My suggestion, Have a good ranking cheat sheet and everyone who gets off the board mark the price next to his name. That way you have an idea what players will go for above or below him (or at least what your league has valued those players at). Another good tip is to go back into your leagues history and see what players went for based on what tier you had them in (top 5, top10, etc).