I am no pro, but DAM* thats a good domain. Did you buy it? Surely you didnt hand reg it. I dont have a real honest opinion on how much but with the .net probably (depending on end user) anywhere from 10k to 50k.
Around 50k-80k at Traffic or DRT, more if you can get Bank of America of Citi interested in it. I've seen .net names to be a hard sell to end users. Most of them still carry the ".com is everything" belief (though its quite justified).