The best will definitely be the new
Rycote INV-7 from their new "InVision" studio range.
Will take any SDC from 19mm to 25mm in diameter.
Not only are they virtually unbreakable - they are technically better than most manufacturer mounts - and at a price you will be surprised at (ie: very low).
In the shops soon - I am definitely going to change all my SDC shockmounts for this new range.