Make sure you get one compatible with your TT. Mitchell is highly regarded, but it doesn't work with my Pro-Ject for example. I got the OEM Pro-Ject clamp.
It helps flatten a record, the Delrin and weighted clamps decouple the record from the spindle/platter a bit helping isolation to the needle/cart/arm. I use the Michell Reflex on a VPI. They have a special version for Rega's and short spindles as well. I got it here: https://artech-electronics.com/shop What table do you have ?
Thats tough one Tim, but seeing its Direct Drive and a bit of a Technics clone it would seem, I would head over to KAB KAB Electro Acoustics http://www.kabusa.com and see what they got there.