IT Infrastructure needs

We are in the progress of setting up an IT services company providing offshore IT Services in the areas of
- OpenSource
- DotNet

Platforms we work on
- Linux
- Windows

Databases
- Oracle 9i, 10G, 10GR2
- MySQL
- DB2
- SQL Server

Application Servers
- Websphere
- Weblogic
- Jboss

Web/HTTP Servers
- IIS
- Tomcat
- Apache

Currently we have our few desktops assigned for every individual projects and I clearly understand that these resources aren’t clearly utilized.

I would like to setup a server which can manage the following
- All the database multiple instance and multiple version in a server
- All App servers in a single server
Same for other requirements too..

Still since oracle requires per CPU, Per Processor, Per Client license, Per Server License. I am not sure how to model the above mentioned servers. Basically how to partition, setup and install things

To be honest I am not even sure what is the difference between a server motherboard and a desktop motherboard, what hardware we require, and what supporting softwares we require for Security/Firewall, Backup and other dependant services

So my humble request is if some of you can help me with a IT infrastructure (hardware, software) for 100 people organization including LAN network setup I will be really thankful

So are you looking for a list of hardware that you are going to need to run the above mentioned for up to 100 users ?

I would say that is kinda hard to say without knowing specifics, and of course your budget.