Which Floor standing speakers with the NAD C356 Int. Amplifier

Hi to everyone,
First of all, thank you for taking your time reading this post.
I have very modest electronics (NAD C356 Int. Amplifier, OPPO BDP93 DVD/CD Player, Monitor Audio Silver S2 speakers). The sound is so so, of course a lack of details and no full range of the sound since S2 are bookshelf speakers. So I am looking for the floor standing speakers that go down to 38Hz-40Hz. My room is 17' x 11.5' x 9'
The speakers would go along with the long wall and not more then 15 Inches from the rear wall. Listening distance is 8.5'. I am listening everything, from uptempo jazz to the dance music. The budget is $3000.00.
So in your opinion, which speakers would have good synergy with the NAD given the size of the room.
THANK YOU IN ADVANCE.