The irony is that while I had the preamp I only used the 101D section which I changed to the amazing sounding 300B tubes. I never used the amp in bi-amp mode. I now have the Cortese (with integrated phono stage) which is not suppose to be used as a bi-amp preamp (due to it not having level control) and I am using it in bi-amp mode. I have 2 Supratek Mondease power amps for the horn section of my JBL 4367 and they have volume control. The bass drivers are being run by a pair of Primaluna's. I also have a pair of Carbon limited REL subwoofers which is a new edition. I couldnt believe the difference a pair of subwoofers makes when properly integrated. Can never go back to no subs after hearing them in my system.
The moral of the story is that regardless of whether you use the pre amp with 1 power amp or in bi-amp mode you have the option available for both and both will will sound amazing. If you can down the road, add a coupe of REL subwoofers, you will be very impressed. It doesnt matter how bigger your main speakers are. Just my opinion.
The polished silver and the gloss black is the best looking combination but unfortunately Mick does not make these anymore due to the difficulty in painting the gloss. Am sure Mick can show you amp if you are in the area but not sure, would have the ask him. Hope all that helps.