Recommend a budget floor standing speaker less than $1,000

Being "blown away" is completely dependent on what you currently have. I was blown away when I upgraded from my boombox cassette player to an all in one turntable/receiver but separate speaker set up. That was 45 years ago but the feeling is still fresh as yesterday. Nothing wrong with the NAD3020 but you better stick with 8 ohm dynamic/cone driver speakers with an efficiency/sensitivity greater than 90 dB. As being blown away, you'll need to be the judge of that.

I've recommended this on this forum before. They can't keep this kit in stock,  its an outstanding value for $1500... It needs a good minimum 40 to 50 watts per channel in a normal sized listen room... They really need something capable of 4 ohms.
Oh, but its under $1000.  Looking is free.

https://www.parts-express.com/solstice-mltl-reference-tower-speaker-kit--300-708

My Tekton Lore Reference are astounding for $750/pair. He has a couple other models that fit that range as well. Pair them with an EL34 based integrated and you will be in heaven for a very low price.

The best options I can think of :
Q Acoustics 3050
Wharfedale Diamond 230
Cambridge Audio Aero 6
Monitor Audio Bronze 5