The Luxman R117 is a classic receiver. At 160 wpc into 8 ohms it will provide lots of silky smooth power. This is one of the few receivers that IMHO stacks up with separates. They are hard to find (no longer made) but well worth the effort. New price was $1200, but I would think you could get one for around $350 - $400. You may also want to try a good integrated amp. The Classe' CAP 150 (151 might exceed your budget) or the Plinius 8150 or 8200 (even the 8100) would be excellent choices.
Best wishes,
Steve H
Best wishes,
Steve H