I've had all three scotches that you've mentioned and they are all great. The Laphroaig Quarter Cask is one of my favorites, too; a finish that lasts what seems like minutes.
If you enjoy the Laph 10 and the Lagavulin, you will definitely like the Ardbeg 10. Over time, while enjoying all three, I found myself wanting to go back to the Ardbeg 10 on a regular basis. The Ardbeg 10 is also a great value. I get it for around $50.
Go out and get yourself an Ardbeg 10. You won't be disappointed.