VPI Scout 2 vs. Luxman PD 441

" For those of you suggesting I keep the Luxman, do I need to spend in the $1,000 range for a better tonearm than the Denon?  A past suggestion has been a Fidelity Research 64S."

Unless you have both TT's for a comparison, its extremely difficult to judge one over the other. I would recommend that you work with a good dealer. Try Larry at Hollywood Sound in Hollywood FL. All he does is turntables. He sells VPI and he probably has some experience with your current TT. He'll give you a straight answer and won't try to sell you something that you don't need.

I would keep the Luxman and upgrade the arm.

Keep the Luxman. It’s a way better turntable. Maybe a new cartridge and a different tonearm would bring new life into that set up

Don´t sell your LUXMAN !! Second everything Dave the Messenger says, he has experienced many HQ decks over the years.
Replace the original elastomer feet with Stlllpoints. Also heavy brass feet or even cheap maglev feet will do the trick IME . And as the Genesis man says, a new decent tonearm will bring new life. Trans-Fi Audio´s Terminator linear airbearing TA is the answer to your prayers. You will then have a true giant killer TT.