Need Help! Thinking of a 4th axis

Hi all,

I was looking at buying a 4th axis rotary table and would like some thoughts on a suitable table. I believe the maximum I can use would be a 4" table.


I already have a suitable stepper. I was thinking of either the sherline cnc ready rotary table : CNC-ready Rotary Table OR,

This Chinese rotary:
CNC Router Rotational Axis The 4th Axis A Axis for The Engraving Machine 1650 | eBay which apparently states it has a Japanese harmonic drive gearbox..

If there are any other tables in a similar price range, I would love to see them.