How about 1.25BTC for 2 years and 4 months?
I'll just jump in and say no on behalf of MOST of the bitcointalk population. Simply because there is no way you can guarantee that you'll keep posting and stay active for the next 2 years, lol. And your ID doesn't exactly refund the buyer if you get killed in an accident, now does it?
I'd say if you really wanted to "sell" your signature, stick with weekly/monthly deals.
Good Luck!