Well,

 I say take offers for a set period of time, and 
post the high dollar amt on your site.  This will 
let people know right away what range they're 
dealing with, and how much time they have to 
scroung something together to counteroffer if 
they want ^_^.  Whooooo, good luck to you!  I bet 
you're getting some GIANT offers!  I wish Id get 
giant offers ;_;