My company is moving from Blogger to our own hosted WordPress site. We do everything in-house, and would like to get a server up ASAP. I setup Google Analytics to estimate bandwidth. I did some searching on minimum hardware requirements, but could not find a gold standard. We're likely under 10,000 unique visitors per month, so I think minimum should be:
100 G HD
Internet connection speed is not an issue. This is just a request for a minimum good performance server so we can get online ASAP, then we'll work on getting a more solid solution up and running.