I like using the Nexus 3K for layer 2 networks. They also have very limited buffering. They work great when everything is 10Gbe connected, but you wouldn't want to 10Gbe connect storage and 1Gbe connect servers to that storage. You would experience a lot of packet loss.
Have you looked at the 3850's? They can be stacked together, have a lot more buffering, and work "normally" when it comes to layer 3.
