MS Office 2000 vs. Corel WP Office 2000

I have a client with 50 users who are
migrating from a Novell 4.x server and
Windows 3.x workstations to a Windows
2000 server and workstation network.
Current office suite is Perfect Office.

The workers need to: share word
processing (in English, Russian and
Chinese) and some data (currently in
Lotus 1-2-3) internally and with outside
agencies, government and private.

We settled on a standard of MS Office
2000. BUT…some senior management
wants to consider WordPerfect Office
2000.

I STRONGLY recommend a single
standard and have been asked to do a
presentation on the implications of
maintaing both suites so workers can
choose. I need facts.