Wellp, methinks I've figured it out. This appears to be a Performance TR1000 frame. The bikes in the following frame match mine to a tee as far as I can tell:
http://www.bikeforums.net/classic-vi...-ti-frame.html
The dropouts are the only match I've been able to find, the place where the seatstays join the seat tube looks right, and the little "titanium" decals that mine still has are clearly visible in the first picture in the thread. The third picture in the thread (upside down one) looks like the brake bridge is consistent as well! Hooray!