Do you really want an Expbus2? I have one and wish I didn't! Once installed its difficult to add new circuits (I know you don't think you will now, but ...). You will also need the annunciator panel to tell you what is going on. After 7 years I believe mine now has a pcb problem that gives me intermittent brown outs. I would buy Bob Nuckolls book and use a fuse panel - it's cheaper, more flexible and more reliable.
Pete