Server Build Advise Needed

[kendel]

Morning,
I have 4 Computer nodes all running a base install of Ubuntu Server x64

I wish to start hosting websites and want to isntall LAMP (Linux+Apache+MySQL+PHP4) and Mail.
I will also be using one of the nodes as a file server.
I will use Webmin as my administration.

Node 1: Apache+PHP4, phpMyadmin, Webmin
Node 2:
Node 3:
Node 4: BIND9, Webmin

I will upgrade later as I go along, maybe add new nodes.


As listed above what should be installed on each of my server to accomplish this goal?
I might ass a 5th Node for my file server.

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Background:
I attempted to so HA+Hearbeat with 2 Nodes and then the other 2 Nodes were Apache webservers. (I was using a howto guide). That worked but it seems like overkill and too much. So I am now looking for recommendations, should I have continued that route or is that a faster cheaper solution...
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[dragoncity99]

I don't typically encourage Linux admins to administer their infrastructure to Webmins....get used to CLI as you need it when needing to support it when comes to issues.

I will prefer more to ask the question how I should design your infrastructure to be secure and stable.