just put something up on the site so you can say you are using it
if they want it bad enough they will pay for it
im sure they will try the variations on it before making an offer
www.madden2006.com doesnt seem to be taken so they could go with that if they feel your terms are too greedy so dont get too greedy or you will lose out on everything and be sitting there with a useless domain name...unless you actually intend to use it
someone definately snatch up
www.madden07-09.com if they arent taken already