Please suggest server configuration

[lonetwin]

Hello Everyone,

i know this is not the right place to post this query, however i want to
seek opinion of all the smart sys admins here.

******************************************

I am expected to recommend a hardware configuration for an application that
my company has developed. The application setup includes :

1. tomcat server ( the front end that would run the webpages)
2. Jboss server (application server, that would do the heavy computing and
READ-WRITE to the database)
3. Mysql server.

We want the server configuration to support 40 simultaneous user sessions.

Can anyone suggest me the points/conditions i should take into consideration
while recommending the hardware. I've done some research online, and the
suggestion is that since jboss and mysql will be talking a lot to each
other, i should have both of them on the same  server. The server
configuration recommended is a Intel Core 2 Quad processor , with 4 GB RAM.

Any help will be really appreciated.

Thanks.