使用小型开发团队实施Team Foundation Server

We have a small 3 developer team that is currently using Subversion for our source control. We expect the team to group to 8 members within the next 6 to 12 months. We are considering changing our source control to either TFS or Mercurial for improved branching. I know TFS is overkill for just branching, but that is the immediate need, and the other features of TFS could aid our team. One of our main concerns with TFS is we've heard that there is a lot of overhead deploying it, especially on a small team. I'm hoping to get some community insight into just how much overhead there may be involved, suggestions to make the process easier, and anything else the community may feel is useful in making the decision to implement.We have a small 3 developer team that is curren