Solid State Power Amps

Looking at the impedance curve that @hilde45 posted tells us you need an amp that can handle impedances that dip below 3 ohms. So, make sure any amp you look at produces enough CURRENT to handle that load. Don't worry too much about watts since the Focal is fairly sensitive and will play loudly with minimal watts. 

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Check out my review of the Michi 8 mono blocks.

ozzy

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Stringamp

UAD220
2×220W rms 8 Ohm, 2x 400W i 4 Ohm, all power is continuous rms  measured at 0.01% thd+N.

Are made to last a long time.

2×220W rms 8 Ohm, 2x 400W i 4 Ohm, all power is continuous rms  measured at 0.01% thd+N.

@gryphongryph This won't matter if distortion rises with frequency. It will cause harmonics in the region above the turnover frequency to be audible as harshness and brightness.

Put another way, THD is not going to be all that important if distortion does not rise with frequency. FWIW, 99% of all solid state amps ever made have a problem with this.