I require 1 - 10 powerful desktop computers...

For each computer:
- Screens should be very large and very good quality.
- Graphics cards should be very powerful because detailed drawings and other engineering work will be done on the computers.
- There should be multiple CPUs - for example 6 Xeon CPUs would be an absolute minimum.
- The internal memory should be at least 16 GB, and substantial memory for the graphics card would be good too.
- The hard disk storage should be at least 1 TB
- Computers must come with genuine licensed microsoft windows installed and with genuine licensed microsoft office products installed.
- All computers should have extended ergonomic keyboards.

Please provide catalogs along with a recommendation for a particular product.