Interesting. I'd have said get those SF Electra Amators based on sound quality, and change amps if necessary. I saw the comment on 'interior designer' and cannot argue with most SF, and those for sure. (I'd also 2nd JA Pulsars, etc.) I'd base amplification on the speaker sound you ultimately desire.
Nice to know you have two good sub options to fill out a good pair of stand mounted speakers. Have fun and let us know on the new ones. I've totally enjoyed some Harbeths at shows. The Super HL5 should be fun.