Which headshell to use?

Hello. I am a new member to Audiogon and am seeking some adivce. I have a vintage system consisting of a Pioneer SX1980 receiver, Teac X2000 reel to reel, Klipsch Belle's and most recently added a Pioneer Series20 Model PLC-590 turntable. It is set up with the Pioneer PA1000 tonearm, but has an aftermarket headshell by Audioquest. Ive installed an Audio Technica 440ML cartridge that I was previously using on my Empire 698. Given that you guys know just about everything with regard to turntable setup and I know just enough to get myself in trouble, could someone please reccommend an appropriate headshell. Any feedback will be greatly appreciated. Looking forward to becoming part of your community. Rick