Hope you do have Daisy around for a while longer. As for the barking...it can be tamed. Both of mine came from the same breeder...Max went as pet quality to another family before us and barks a lot. Kaite, who became a show dog and breeder, doesn't. She will when someone is at the door and Max starts up but she was trained not to bark as much as they are inclined to do. Don't ask me how...but I'm sure there are some on here who could give excellent advice when the time comes.
Best wishes for your Daisy, I too have an older friend 15 1/2. With your track record, my guess is that you will do well with any breed or dog you choose to get. Success with the current dog is the best predictor of success in the future. The only thing you will have to adjust to is the energy level of a puppy, one forgets after all that time! If you are not ready for that, one that's a bit more mature may be a better fit. Many nice dogs find themselves in need of a new home through no fault of their own. I adopted my Corgi at 1 yr. of age. He needed a bit of work, but he has turned out wonderfully for us all, including the other dog members of the family.
I thought it would be a good idea to show off my Daisy since I don't yet have a Corgi pup. I attached a picture, and also changed my profile picture to Daisy all wrapped up like a spoiled little burrito during a nap.