USB to DVI A1082 Cinema Display Issues

I have a 2GHz i7 MBP. In the office I run two external monitors, both are Samsung 23" Syncmaster 2333.

One Samsung is from the Mini Display Port via Apple Mini Display to DVI adapter.

The second Samsung is from a K-World USB to DVI adapter.

These work fine.

I cannot make the K-World USB to DVI adapter paly nice with my A1082 23" Apple Monitor. I have two of these Apple DIsplays and want to replicate the set up. I have tried other USB adapters and agian, no joy.

Is there a USB Adapter in existence that works for these screens? I would hate to buy everyone on the market just to find one that works!

Any guidance or help greatly appreciated. I have been to over 4 Apple Stores, and get looked at like I have 2 heads.