I've owned one for a while and it's a fantastic watch. Love the look and the complication.
I sold it mainly to partially fund my 5960P, no regrets. Also wearability and comfort, with my medium-small sized wrist, wasn't perfect.
In your case, having a 5980/1A, I don't really know what to recommend. I would probably go with the 5726A due to the strap (you already have a Nautilus on bracelet) and the complication, I do love ACs.