Don't know about Luxman preamp. Luxman has nice reputation. I used to own a Luxman integrated with tubes that you could see through a window. That was nice sounding for budget system. If I were you, I would ask if they could loan you the preamp for a day or two so that you know if it works for you.
Keep the BEL amp. You can build a nice system around it.
Keep the BEL amp. You can build a nice system around it.