Low Power Krell for magnepan MGIIIa

I have a pair of Magnepan MGIIIa and am thinking of upgrading my amp from B&K ST202(200w @8ohm). I've seen some of the old Krells or Levinsons particularly the KSA 80. Is 80 watts(160 @ 4ohms) enough for these speakers? I blow the fuses all the time on the ST202's. I know power does not mean anything for these amps, but then why doesn't everybody just get the smallest Krells.