My first road bike was a 1993 Trek 1200. I loved that bike so much!!!! Til it was stolen a few months ago
I'd still love it today had it not been stolen. Anyway I've since replaced it with a CrossCheck and have a recommendation for you. Just ride what you've got! Depending on where you want to go and your commute, your 1200 may be just fine as is. You don't
need a specially made bike with all the braze-ons in the world and a 11-34 cassette, and a 22t granny to go on a tour! I recently rode a couple hundred mile mini-tour with my buddies who don't have the right bikes at all (older roadie similar to your 1200 and one on a single speed road bike) and they made it just fine!
This option costs you nothing (except for racks/bags - both of which you'd have to buy regardless) and you really get an idea of what you want to save up for (if at all). Run what you have and go from there.