The list is long.As for the differences between a DL380 and a DL580 (or 585), if scalability over time is an issue I would take a serious look at buying a 580/5 instead of a DL380 - you do not need to load it up (e.g. put only 2 procs in it for now) but it is a lot easier to pop a couple of additional procs/more ram into a machine that already has the extra slots than it is to migrate to a bigger machin