40 servers sounds dreamy...I've been dealing with far more for the past few years. Yeah...IPMI is pretty huge. I've been using Dell's (Broadcom's) stuff for years, but Supermicro makes a lot for everyone else. If you can mount ISOs from a server room NAS or SAN, it makes for much quicker installs if you ever need to mount a DVD for remote installs.
With dual monitors running Xubuntu and multiple workspaces, I can manage just about anything. I just run Windows in Virtual Box for VMware Infrastructure Client, use Remmina for Linux to RDP, and SSH from terminal emulation....it's a pretty sweet setup.