I am putting in a wall of sleek, modern storage cabinets in my dining room. These are just the frames, there will be three doors per frame, bottom two are plain white, top one is glass. It's the one here http://www.ikea.com/us/en/catalog/products/S29059448/ only I plan to put the glass row on top.

I have height extension cabinets that I can add on to these for more storage. For the low point of the ceiling on the right, the height extension would be very close to the ceiling, within inches. The height extension would not block the air intake vent you see.

Should I add it? More storage would be nice, but would it overwhelm the space? Look too tall?

Please note the table is pulled back from its normal position and the rug won't be there.

Thank you for your input!