+1 for keep the F and the F100.
given comparable conditions, the original is always going to fetch more money (but black F apollos are likely only going to go up in value). it's probably not worth that much more than the F2, but that means you can unload the F2 at a reasonably high rate (since you're looking for cash).
the other manual focus cameras are pretty easily replaceable, and between the F and the F100, there are basically no lenses that you can't use.
if you want mechanical fondlage, take out the F. if you want bang-on reliable metering and AF? grab the F100. there's nothing that the others can do that those two can't, and the reverse is not true. plus, they're easy, and will continue to be easy, to replace (provided they have no sentimental value for you).
though i guess it really depends on how much cash you want to raise, and how fast you need it...