I have the same speakers, love them. It seems a small room, you could go with a good quality integrated amp. I use the Pathos classic one and it's amazing. Never felt underpowered. I have yet to revise my system in audiogon but I've moved again, have a larger room and the Pathos still hangs on. My room is about 18ft by 14ft.
But even before changing amp you should consider equipment support. It might be more cost effective. That table seems to me needs a bit more mass, maybe another layer or two of horizontal boards? Then you could replace the stock power cords, if the NAD permits it. You could start by something from the same brand as the interconnects.
Have fun
