With the exception of the one Elite Model and, possibly, the PL-1000, my vote for the best Pioneer TT goes to the PL-600. Bear in mind that there were actually two PL-600s. The later model was of the cheap black plastic variety. But the one I'm talking about was built to "broadcast standard" levels and weighs a ton. The base is all thick metal with anti-resonance properties. it has a dual-isolated suspension and 4-point gimbal tonearm. The platter weighs more than 3.5 lbs. And, with Quartz lock, it sounds about as good as any Direct Drive I've heard.
I thought the the PL-670 might be the better model, but, after buying a PL-670 and noting the cheap plastic base and other evidence of cost-cutting, I quickly deemed it not what I wanted an sold it. I own three (3) PL-600s, one of which is a parts unit for the other two. It has no vices that I am aware of....and, because it is confused with the other PL-600, I can be had very cheaply.
Here's a pic of mine: