Klipsch Chorus II for $600, yes or no?

On another positive note, the Chorus 2, went from a front ported enclosure, to a sealed enclosure, using a rear facing passive radiator, and was much more successful in sales, and was produced for twice as long, as the series 1.

" About the crossover swapout, are these really necessary? What difference would it make to the sound vs. just leaving the speakers at factory spec? "
  OK if those capacitors were in spec there would be no reason to rebuild. I use a B&K 885 meter to measure inductance and capacitance and I will tell you flat out those appx 30 year old capacitors will have high ESR at the least and the capacitance may have drifted too. I have gone through dozens of sets of old Klipsch speakers and not one set of crossovers was factory spec. If you know how to solder this is easy to do and won't cost much. Last set of Chorus I's I had were pretty sour until recapped and I wish you could have heard the difference before you asked this question.

Yes, grab them.  Or PM me and I will.

Yes, $600.00 in good shape is a very good price.  As far as refreshing crossovers with new caps, make sure it is needed before purchasing new ones or even just new caps.  Previous owner may have already performed the update.

Bill