My first reaction was Swarovski, Nightforce, Zeiss, Leica or the Leupold Mark 4. However, you dont need that level of capability for a gun that you're only going to run out to 400 yards. You're not even realizing the benefits of those scopes at that range.
I'd look at the Leupold vx3 4.5-14 for your application. Clear glass, precise adjustments, great durability and the best warranty in the business.
Do it right once and you'll only have to buy once.