If customer service is your issue and you don't like Marantz/Denon, that also rules out Onkyo/Integra and Harman Kardon.
That leaves you with Yamaha and Pioneer. Since you're not playing in the sub-$1k market, you can also bounce around with Rotel, Sherwood Newcastle and Cambridge Audio. There's also Sony. People say the ES stuff is way better than their regular mass market STR lines. The regular STR lines (e.g., 520, 620, 720, 820, 920) aren't known for their reliability, either.