That's a fairly old ST, and there are quite a lot for sale in the $5000 range. Yours has remarkably low mileage for its age- there are bikes on this forum that do those kays every year.
What bike do you think would be lower? ST1100s are not very tall. If your situation is challenging for an ST, maybe you should look at a Suzuki Bergman. Although they are a scooter, they are Maxi-scooters, with 650cc engines. They have a large amount of storage space, and being quite low, are favoured by those needing something a bit less demanding than a motorcycle. I've ridden in a group with them and they keep up and manoeuvre very well.