I would second the advice to begin by selecting speakers first. Then you will know the impedance and power needs.
For acoustic classical and jazz at moderate levels with near-field listening (you said the room is small), I would begin by looking at Spendor, Harbeth, and any of the LS3-5a variations (used originals or current knock-offs). Depending on his tastes and the set up, a sub may not be needed.
If he chooses a 16 ohm Rogers LS3-5a the amp choice could be quite different from some other model with a 4 ohm rating but higher efficiency.
For acoustic classical and jazz at moderate levels with near-field listening (you said the room is small), I would begin by looking at Spendor, Harbeth, and any of the LS3-5a variations (used originals or current knock-offs). Depending on his tastes and the set up, a sub may not be needed.
If he chooses a 16 ohm Rogers LS3-5a the amp choice could be quite different from some other model with a 4 ohm rating but higher efficiency.