Solid State Power Amps

you should audition an Ayre product.......very neutral and high end gear

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. 

The new AGD Solo LE amps! Their amps can be upgraded as the technology improves.

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.