under normal circumstances, these are the obvious upwards moves in the food chain, since you already have the super 5...
https://store.acousticsounds.com/d/132377/Spendor-SPENDOR_CLASSIC_100-Speakers
https://www.audiogon.com/listings/lisab16h-harbeth-40-3-xd-full-range?acq=fuel&creative=shopping&gclid=CjwKCAjw-sqKBhBjEiwAVaQ9a1WFRC6mEQygVtE8LBR88AK1vm7iPj3gI1IR86D6oSxZq4UGn37EYxoCvEsQAvD_BwE&keyword=speakers
https://onahighernote.com/shop/speaker-systems/monitors/graham-audio-ls5-5-loudspeaker/
... but your room is limited, so i would consider top tier smaller proac floor standers, or same from joseph audio, or the fritz carrera be w/ sub (gotta pay to play... 🤷♂️)
https://store.acousticsounds.com/d/132377/Spendor-SPENDOR_CLASSIC_100-Speakers
https://www.audiogon.com/listings/lisab16h-harbeth-40-3-xd-full-range?acq=fuel&creative=shopping&gclid=CjwKCAjw-sqKBhBjEiwAVaQ9a1WFRC6mEQygVtE8LBR88AK1vm7iPj3gI1IR86D6oSxZq4UGn37EYxoCvEsQAvD_BwE&keyword=speakers
https://onahighernote.com/shop/speaker-systems/monitors/graham-audio-ls5-5-loudspeaker/
... but your room is limited, so i would consider top tier smaller proac floor standers, or same from joseph audio, or the fritz carrera be w/ sub (gotta pay to play... 🤷♂️)