Being new to the Linux world, I'm thinking the below specs will be fine for OES on Linux, but just need some confirmation.

Quad Core Opteron 2387 Processor
2.8GHz 4x512K Cache
16gb RAM
Lots of disk

Will be running OES, GW8 (POA/MTA/GWIA/Webaccess) and Zenworks Config Manager for about 40 users.