I you liked the Naim Atom, you might want to consider the Naim Uniti Nova. I haven't heard either, but with the Nova, you would have the convince of the Atom with more power.
I own the Hifi Rose RS520 and it is great as an all in one amp. It doesn't compete with some of the better amps that I've owned in the past, but as a streamer with the watts you are looking for (and a wonderful touch display), it is a pretty nice unit and well below budget.
The Lyngdorf 3400 might be another consideration in the $7k range.