Server 1 - Nginx proxy / load balancer serving all static content (images, html etc)
Server 2 & 3 - Apache (Run as a DSO)
Server 4 - DB only
Over kill for what you have, but none the less fun to play with.
If any of the servers are raid 10 capable, use it as a db server.
The nginx server can get away with minimal ram in it, give as much ram as you can to the db server as well.
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