High end high quality int. amp for low level listening


Hello to all Audigon members.  I'm quite in a dilemma weather I should upgrade my amplifier. Currently I own Pathos classic one MK3 driving Sonus Faber Sonetto's speakers, and I must say I'm very happy with sound filling my 35 square meters room. However, it's known that the speakers are power hungry as they rated at 86db sensitivity and 4 ohm impedance and I think they will surely benefit from a bigger power supply. With all that being said I'm not sure if I will hear any improvement mostly because 90% of the time I listen at ~60dBs SPL. My budget is around 5k $ and these are the amplifiers I've been considering:  Hegel H390, Anthem STR, Cambridge Audio Edge A, McIntosh MA5300/MA252, Accuphase e280, Rotel Michi x3 or used Pass Labs INT 25, Mark Levinson 5805.

What do you think guys, will any of the amplifiers make ay difference at 60dB SPL ? 
celestial__sound
+1  @ditusa 

The Pathos is a great integrated amp... but it is a poor pairing with high impedance low efficiency speakers, as the OP stated in the original post.  You have a choice — keep it and get 8 ohm or greater speakers with a sensitivity of ideally 92 dB/1 m or greater (having subs in the mix will lessen the load on the amp and allow lesser sensitivity) —- or get a high wattage solid state integrated amp to go with the Sonus Fabers.  Hegel would be a good choice  

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There aren’t too many integrated amps that double their power wattage into 4 ohms. The Levinson 5805 does (125 watts into 8 ohms, 250 into 4 ohms).  If you decide to keep your speakers, I would lean towards it or one of the Hegel integrateds myself. 
having subs in the mix will lessen the load on the amp and allow lesser sensitivity
How big of a concern is the load on the amp, when the SPL is in the 60s of decibels?