New network layout.

Hi,
I would like some advice on the recomended setup of a Network with Server
2003 and Active Directory.
There are currently Linux boxes acting as a Firewall and gateway to the
Domain and I would like to replace it with Server 2003 and ISA 2004.
I am also looking to implement Exchange Server 2003 into this network and
would like some advice on setting it up so it is load balanced for all the
tasks needed for the company, for example: RAS, FTP, Webserver etc.

Please tell me if I am in the right Discussion Group before I continue with
the details?

Thanks,
--
Stuart Pavy
(E-Mail Removed)