I was going to point you to the Pure series of roms by Beanstown, but I don't understand your question... You don't want ANY custom stuff at all or features, then what's the point? Just install stock android...?
The point isn't that there are no vanilla AOSP ROMs for most devices. The point is that they usually suck, and a reputable well-supported one that actually worked properly would be a massive innovation.
When people say "Google's phones" it is generally understood to mean the unlocked line of Nexus devices that they sell directly and provide updates/firmware images for directly.