Not having heard the Silver 88, but just read the description on his site, it would seem that if the 88s do have the lowest about impedance (higest damping)that the 88s should give you controlled bass (for a tube amp)with a lot of purity that comes from the simpler output stage. There is something to fewer tubes making for better sound IF you can get enough power, and I think 80 watts of tube power is plenty of power for your application, I doubt you could hear any meaningful difference between 80 and 120 watts.