For the record, since nobody has mentioned it yet: Skystone Chests (from AE2, the ones that hold the inscription plates inside the meteors) also don't care if there's a block on top of them. They can be salvaged from the meteors or crafted from harvested meteor skystone. And they even look nice with their almost pitch-black color.
If you don't need tons of storage space, Item Buffers from EnderIO might also suit your needs. As part of some complicated machinery setup, I actually prefer those to regular chests. Imho, plain old wooden chests look kinda stupid as buffers between pipes, machines and other high-tech stuff. As a bonus, they can actively pull and push items without the need for servo-equipped pipes or whatever.
