I had the i5.3 driving my Cremonas, but upgraded to the i7 and didn't regret the move at all. The i7 took control of my speakers in a way the i5.3 could not. I also listen at high volumes but have never had any problem with the i7.

i heard this amp when it was current several times at my local store.  it was primarily driving dynaudio speakers from small to large and it was excellent.  i would have owned it if i were not a tube guy.  i don't think you would regret the upgrade.

best of luck,

tom