I hope your Lyon and Healy can be repaired. And I must say, double harp is wonderful for all the reasons others have mentioned, and the resources listed above are great. I have a double Brittany made by Stoney End, and while I love it, probably would have gotten the 29 string double had I tried them out.
If the budget allows, I’d say repair the L & H, AND get a double. Stoney End does rent to own, a great program to assist those wanting to play.