Suggestions for arm to replace VPI 12.7


I am thinking about replacing the 12.7 tonearm om my VPI Classic 3 turntable. My budget will be about $4000, and I'm willing to buy used. Does anyone who has replaced a VPI 10" or 12" tonearm have any advice regarding a compatible replacement?
sdcampbell
Stringreen, did you need to redrill mounting holes for the arm or is the geometry the same as the VPI non-3D arms?
Following some further research, I decided that there aren't any good choices to replace the 12.7 arm unless I also make some modifications to the plinth. In short, too much work and expense. So, I decided to stay with VPI, and have purchased the 12" 3D printed armwand. It should arrive in a few days, and I'll add some comments about it after some listening.
Make sure to get and use the SoundSmith Counter Intuitive, which makes setting VTF and azimuth MUCH easier, faster, and even enjoyable. If it does not move smoothly on the counterweight, then they sent the wrong counterweight and should be replaced with the correct one so that this device works properly. I had that problem the first time around with my 3D arm.
I would be interested, Sdcampbell, in your thoughts about the new arm, compared to the old one(just checking my hearing, here.).
Follow-up post: in a few words, the 3D printed arm is SUPERB! I can hardly believe how much the 3D arm improved the sound of my system.