The absolute most bang-for-your-buck, in terms of portability and utility, is one or two Specialized Nanohives that produce Protean Swarms that themselves produce a Desktop CM; and a big storage block containing epic craptons of nanofabricator blueprints, including the tested way to rapidly go from a Desktop CM to a larger nanofab, to an industrial nanofab. Add some Guardian nanoswarm generators to keep things safe and some kind of inflatable shelter to create a stable place to build your first nanofabbers, round out with some small arms and explosives; digging explosives would be just as useful as combat explosives, depending on the area, since you could go dig into a hillside, and don't forget to throw in a few RTG batteries to power it all. You may also need to include some feedstock of the rarer elements, at least the stuff you'll need to produce a CM or two. If you're in the middle of a full-on freakout and don't have the time for setting up the nanofabrication you need to deal with things, then chances are that the time for anything except mass destruction has passed, so a nuke or an antimatter bomb is probably your best bet.