Upgrading - Yamaha RX-A4A with ELAC Debut DFR52 speakers

The title says it all really. I going to upgrade to a RX-A4A. I use my home theatre everyday as the main TV in the living area. The living area is a rectangular 4m x 5m room, carpeted, and fully open to the rest of the open plan living area on the lefthand side. I've been using Energy floor standing speakers as my mains but I intend to move them to the back to replace a couple of Energy bookshelf speakers. I have a Yamaha downward firing sub front right that I run fairly hot.

Any thoughts on the match? Any thoughts about the speakers? They'd be close to the top end of my budget.