Two channel yamahas sound nice with the l100s. I would recommend something with power. Perhaps check out emotiva which sells quality and fair priced amps.
The L100s are fairly sensitive. A lot of people rocked their dorm rooms and living rooms on around 50 wpc back in the '70s.
It sort of depends on your room size. Today I'd go for an NAD integrated (e.g., 356BEE (80 wpc) or 375BEE (150 wpc)) and it'll be way better ampification than most L100s ever saw, which was usually a mid-'70s Pioneer or Marantz 40 wpc receiver.
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