I think you would be minimally powered with either of those choices (as well as the amp you have now) based upon the specs of the Harbeth. I have used a Cary Sli-80 with speakers more efficient than yours and in a smaller room and do not believe you would be happy with it. It's a very seductive amp, but I sense its power ratings (40w triode/80w ultralinear) are a bit liberal. Plus most people like the Sli-80 in triode mode, which offers no more power than you have now. The Sixpacs are only 50 watts as well, so they would not be a great leap in power. So, to avoid simply making a lateral move, I would suggest looking for something with considerably more power, especially since you're in a relatively large room.
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