Tonight I locked my Downtube VIIIH outside of a friend's house for a couple hours and when I went to leave, lo and behold, my seatpost was missing. The bike was locked with a 1.5' cable and master lock (which doubles as an easy seatpost height marker) which I usually also lock the seat with, but this time there wasn't enough slack.

I'm thinking I'll either do:
A) Get a new seatpost and sell the bike along with all spare parts (namely, two big apple tires, a new 39 T chainwheel, and a new rustproof chain). The Downtube will never be safe outside without extensive locking and is simply too large and ungainly to impose upon hosts; The Carryme is plenty of bike for urban riding.
or
B) Get a new seatpost and a 3-6 foot long steel cable and religiously secure seatpost, wheels, and frame together when locking up.