If the Focal has Beryllium drivers, then to my ears, the KRELL K-300i integrated will be an upgrade. The K-300i is a single box with optional internal DAC and ROON READY. This unit is a killer piece. I sold my recently only because I bought the KRELL Duo 175XD stereo amp in the same lineup.
The used amp listed below is what I wanted to buy but I could not make the money work, so I ended up getting the lower powered KRELL 175XD instead.
Krell DUO 300 XD | Solid state | Covina, California 91724 | Audiogon
I am not sure how this would work with your MAC preamp, but even a $2500 Benchmark LA4 would work great with that used KRELL Dou 300XD and the Focal. I know because I tried the 175XD with the LA4 preamp.
Though for the sake of simplicity and sound the K-300i is my fav integrated amp. I considered the Luxman 509x but the K-300i was more to my tastes. It sounded smoother (90 watts Class A) and had good bass power. You will not get fatigue with the KRELL. There is a recent thread on this integrated amp.
BTW - Luxman is not analytical. It is warmer than the KRELL I am recommending.