I lived with the EVO-4 Gen II (actually two of them for tri-amping) for about 6 months. It's a wonderful amp and very flexible. However, for about the same money of a used EVO-4 Gen II, I would strongly recommend you audition an ICE H2O S250 Signature. It was this amp that dislodged the EVOs from my system.
It's a 250 watt per channel, stereo amp whose heart is an ICE module. The module is surrounded by a huge, high quality, low impedance and FAST analog power supply.
Tonal character of the H2O is very similar to that of the EVO, which is fundamentally neutral. Differences between the amps in the context of my Apogee based system were centered on openness, midrange palpability and bass authority. H2O owner Henry Ho is a true gentleman and will float you an amp for an in-home demo, no strings attached.
With either choice you get a great amp and we should all have such difficult choices!