As for the wants of going bi-amp, I'm quite sure a pair of these beautiful "Hernia Makers" would be the cat's meow, and look quite lovely sitting between a pair of the majestic 4345's! The price of admission is a shocker though!
Maybe one day they'll come with a smaller brother, and a more sane price. LOL
https://www.youtube.com/watch?v=fTWjZz5Zgug
https://www.youtube.com/watch?v=GOOASnJ5D9g
For many decades, I always felt the McIntosh-JBL pairing was a match made in heaven!
I don't think too many here will dispute my claims!