since you do not already own the Luxman integrated what possible advantages could it have compared to a standalone preamp?
the idea of manufacturer to manufacturer synergy is not necessarily going to give you the best sound for the dollar.
I recommend an upgrade to the Rogue RH5 (which I owned, it was a highly dynamic neutral sound that was missing the tube refinement and sound stage).
Try the Cary Audio SLP 98 or SLP-05, or the Rogue RP-5 which sounds spectacular.