Integrate amp for gallo refernce 3 speakers

I would add the Edge G3, Ayre AX-7e, Blue Circle NSCS and maybe the Bryston B100 SST to your list. Take this with a grain of salt since I have not heard the new A5 but none of the MF products I have heard have struck me as involving. YMMV

Henryhk, sorry I can't be of much help in A-B comparisons as I haven't had those amps together in my system. My sense is that the Ayre is slightly softer sounding but I wouldn't take that to the bank. Plinius seems to be a quite matching sensitive as it has sounded great in some systems and too warm and slow in others. To throw one more integrated into the mix the NAD S300 was quite good and a used one might be a great buy. It is basically a rebadged Gryphon Tabu.
I'm not a huge fan of the Krell and I have some reservations as noted about Musical Fidelity products. The TACT and the Joule I haven't heard but all others candidates that have been suggested strike me as reasonable choices. A great deal is simply going to come down to individual taste. There simply aren't any bad integrateds in play here.