cj made a lower powered 2250ss power amp that is 125 wpc and would work nicely when combined with one of their tubed pre-amps. I am not necessarily pushing cj here but they are a very reputable high end manufacturer with great customer service should you need it. And this combination will provide the smooth sound in the mid to upper frequencies you desire along with good Bass control. Also will easily fit your budget (used).
Chuck
Chuck