Best Integrated for 400 dollars

Not sure how much power you want/need, but the NAD c370 is a great value around this price. A conservative 120wpc. If you don't need or want that kind of power the NAD 3020 is great too. At this price point NAD is tough to beat IMO.

Second the Creek. Great sound for tiny $$$.

Spencer

Gotta give the nod to the new NAD BEE

Musical Fidelity 75 wpc X-A2 is more powerful than Creek. Sold for $700.00 new. Thus would be near the top of my list if you can find one. They usually sell in a couple of days. What Hi-Fi compared it to ~$1,600 X-A1000 and said it was BETTER.
It is a 2-box design with outboard power supply which sort of defeats the point of an imtegrated IMHO.