Ref 5k vs 7k vs 3k

[Jdsmoke]

I have been bitten by the upgrade bug and I’m looking at my speakers first. I’m considering the Cantons and I’m trying to understand if there is a noticeable difference between the 5k vs 7k vs 3k. My room is only 18 x 12. I was thinking the larger size of the 3k might be overkill for the room. These will replace my Harbeths in my primary 2 channel system. I was leaning to the 5k as it would free up some funds for other upgrades but could stretch to the 3k if it was a substantial improvement. I mostly listen to (80%) 1980s to current rock with some (10%) acid jazz and (10%) broadway shows. Any advice would be appreciated.