So you need about 1 Watt per channel, give or take? (75 dB SPL listening level = 0.1 W with speaker sensitivity of 85 dB SPL per 1 W @ 1m; 3 m distance squared = factor 9, so 1 W.)
So any amp (with good measurements) will do, and you can go just by optics, price and features. How about the...