Tonearm for Luxman PD 441


I have a late 70's Luxman PD 441 turntable with a Grado The Reference high output cartridge that I really like.  I'm thinking that my weak link is the old Denon DA 307 tonearm with that goofy rubber for damping.  Any suggestions on an easy switch for under $1,000, even used?  Thanks all.
bdunne
Thanks for the heads up.  I wonder how I find options that will fit similarly to the existing Denon arm?  I'd rather not get into chasing down rare and expensive tonearm bases.  
SME III with top MMs (high compliant) like SHURE ULTRA 500, Audio-Technica AT-180ML/OCC and Grace F-14 fits nicely the LUXMAN PD444 in sound quality IME. Indeed you would need a special arm bracket for SME arms. Good luck.
Fidelity Research FR-64 had the same 230mm mounting distance , is a drop in replacement of the DA307.
I have a PD-441 with a Fidelity Research FR64s, the optional vertical height adjuster, and a Yamaha MC-1s moving coil cartridge. It is my second-tier table, but I am very pleased with (and actually surprised at) how good these pieces sound together, plus they look absolutely fantastic.
Seems like the Fidelity Research FR 54 is a lot less expensive to buy than FR 64.  Is there much of a difference?  They both seem to be same dimensions, so should work with my PD 441