DCM Time Window 1 questions

I am considering purchasing a pair of DCM Time Window 1 speakers (circa 1980), and I am wondering:

-what would be a reasonable price for a pair in excellent condition?

-what would be the absolute minimum amplifier watts per channel to get good sound from them?

-how would these compare in audio quality to a set of well-made but inexpensive speakers with current technology?

Thanks for any input-