Optimal Web Hosting Configuration

If this question has already been asked, please just direct me to the thread and ignore me...
What is the optimal configuration of servers for a small web hosting company. I am just gathering information at this point, but if I start a company, I want to do it right. What would your suggestions be for the optimal number/type of servers allowing for good performance and growth potential. (i.e. 1 DNS server @ 300 MHz, 1 email server @ 1 GHz range, 1 web server @ 1GHz range or whatever you think is best) Any opinions would be greatly appreciated. Thanks a lot!

 

 

 

 

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