If your looking for a great idler that's a "sleeper" so it can be had for a reasonable cost you might look into a Gates CB-77. These are broadcast units that are built like tanks. A unique feature is that the idler drives off of a hub cast into the inner portion of the platter as opposed to the outer rim. This allows the motor and idler wheel to turn slower eliminating much of an idler drives rumble and noise. I've had a 301 and a TD124 in my system and prefer the Gates. Good luck.
Idler drive turntables
One sees all sorts of data re Garrard 301/401, Thorens TD 124, and Lenco turntables of the 60's and 70's. These TT's if restored bring lots of $ on the used market! What about the Benjamin Miracords of the same era? My first "serious" hifi system in 1970 consisted of a Miracord 50H with a Shure M91E cartridge, a Fisher 600 receiver and KLH 4 speakers. Sometimes, even now, and thousands of dollars more, I yearn for the sound of that system! Just how does the Miracord stand up to those icons??