agree with the comments that learning to do the work yourself is the best course of action. If you're not afraid of getting in there and learning how to do things yourself, there is plenty of support here to help you with the job.
most ST1100s won't need valve adjustments until the 75k mile range, chances are pretty good that yours are still in spec, so doing nothing at this point is as good an option as anything. On that topic specifically, I'd recommend leaving it alone. If you're adventurous, its really a pretty simple job to check the clearances, the worst that can happen is when you put the valve covers back on you get leaky gaskets and have to replace them. They're not cheap, and there are grommets on the bolts that hold the covers on that compress over time and may also need replacement. Between two new sets of grommets and two new valve cover gaskets you could end up dropping $100 ($30 valve gasket x 2, $5 grommet x 8) just to prove that your valves are still in spec. You don't always need to replace those every time, but given that yours are 26 years old and probably never been removed, its anybody's guess what shape they're in for re-use.
There is one thing that ST1100s eventually need, to have the coolant hoses under the carbs replaced. Given your low mileage, and presumed mild climate that its been run in, its possible that yours are actually OK. I'll let people from your part of the country comment on that, I live in a much warmer area and have far more miles on my 1100, mine failed 10 years ago.
The reality of owning a bike of this era is:
1. poor dealership/independent mechanic support
2. high cost of said support relative to the value of the bike, if you can find that support at all
3. parts are becoming more scarce by the year
