I'm actually running server 2012 on a precision t6700 [^]. Very easy to swap drives with it, they are all ejected through the front of the case. No need to open it, just remove the front cover. Room for 4 drives this way through a full blown power edge raid controller. And since I'm doing a good bit of sharepoint development on a number of different versions, I make a lot of use of hyper-v to vm all the different parts of my dev farms. Works well for me so far!