I had both a Pass pre & power, it was the best of tube and SS, it matches what you describe you are looking for. I also have a Coda power amp that exhibits the best of both tube and SS. The Coda doesn't have as large a sound stage as my Pass, vocals are very intelligible, the Coda actually reminds me a bit more of my prior CJ with a sweetness to it and vocals more out front. I'm not sure if they made an integrated.
A friend of a friend has a ASR, I unfortunately haven't heard it, however, you are correct in your reservations regarding service. If you are close to a dealer or large metro area maybe service is better but I'd make sure before committing.
You might also give a listen to a Mac integrated, I'd expect them to run cool, especially no harder than you'd drive it with Zu
I wouldn't describe them as "tube like" but you might just find you like the Naim integrated amps. Not large power ratings but they do have drive (current) and musical. IMO