Thanks for those that have already accepted!
For the record, I'm offering 0.5 BTC for 30 days of exclusivity in your signature. I based that price off of
this auction, in which nimda sold his sig space for 1 month for 0.7 BTC. He has 1000+ posts, and a historical trend of posting ~9 times per day, whereas I only require 100 posts and 1 post per day.
There are still a few slots open if anyone else is interested!