We're going to purchase a couple servers to OES/Groupwise/Zenworks on. Can someone let me know if RAM/CPU sizes are OK?

Zenworks Config Mgmt.
Groupwise GWIA/Webaccess
2TB Disk Space

Server 2
Groupwise 8 (200 users) Post Office
1TB Disk Space

Would 16gb on each be enough? Supreme overkill to get 32gb?

Would dual quad-cores be helpful? Or overkill?

I'm think that may be a bit much, but we want to run strong now and in the future, as we may add 150 more staff to the Post Office.