Hvilken version skal jeg have ?

It depends a little on your hardware as well.

Web edition supports only 2GB of RAM and 2 CPUs
Then remember that other limitations are:
The server can not be made into a SQL server, domain controller, or Exchange server.
The server is limited to 10 UNC connections (\\servername\share).

Unlike some think, "Web Edition" supports an unlimited number of websites and http connections. The number of web sites and http connections is only limited by system resources.

Så bør du kikke på en small business server 2003. den indeholder både serveroperativ systemet og IIS og vil være den billigste løsning. Jeg kan ikke se dit link, da jeg ikke er oprettet