Not sure if you have stopped pacing up and down in your living room (I sure don't want you to have a heart attack) but here's my no. 8. I am surprised this didn't cut your list. In any case, it was their last major hit and their last No. 1 hit in many countries. And their last single from their last album - The Visitors.
They never sung this song live so I don't have a live version alas but the video is pretty good so that will do. Better than nothing. Agnetha said it was one of her personal favourites.
No. 8 One of US
I also like this slow version by the Flowing Tears - a German gothic metal band. The emotion is a bit over the top but I still like it. To be honest, there are many covers of ABBA songs but I only prefer the metal versions and I am not even a fan of the metal genre. Abba songs just go very well with metal IMO.