How big is the room you have and what are your expectations or hopes for the new system? I personally have older Focal 706s and they are powered by a 40 W amp. The room is smaller but completely filled by the small bookshelf speakers. I think I’m only limited to room nodes as it is almost a perfect rectangle room.Focals are very easy to power, a decent 100wpc amplifier should be able to make it uncomfortable in anything except a very large room. Make sure you give them a quality signal, CD or uncompressed music and you will be very happy with their output. If you think you need more output consider a quality subwoofer.
edit: your Rotel should be fine, the difference between 60 and 100 watts is negligible