The MA-505 is a good choice. VTA on the fly, removable headshell with a built-in stylus overhang locator, easy VTF adjustment. Some people say it betters the DP-4. I haven't made the comparison.
My opinion would lean toward the Micro Seiki MA-707. Has removable headshell and variable effective mass. Easy to tune the arm to the optimum resonance frequency. Very easy to set tracking force (just balance the arm and dial in the VTF). VTA can be set manually. IMO, it's more difficult to adjust effective mass than VTA.
My opinion would lean toward the Micro Seiki MA-707. Has removable headshell and variable effective mass. Easy to tune the arm to the optimum resonance frequency. Very easy to set tracking force (just balance the arm and dial in the VTF). VTA can be set manually. IMO, it's more difficult to adjust effective mass than VTA.