I need to put together a system which will run on windows 2003, SQL Server 2005 and a mixture of classic ASP and .NET.

Ideally I will have a dedicated SQL Server and a Dedicated Web Server.

What sort of server specs would you recommend for the web server and the SQL Server?

There will be appx 16 million members, who wil be allocated appx 5 MB of space each although I would say only 25% will take up the offer of the storage space.

Not all 16 million members will be online at once of course but the web server needs to be able to handle a high volume of traffic.

Does anyone have any experience in this kind of volume to give me a realistic server setup spec?