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Sub Zero by far will be the best column for reliability service and parts! I have seen them fix 20 year old refrigerators they really are the tops in this type of product. Thermador is a close second as their columns have come a long way over the years. Fisher Paykel great company but very new to the columns. 84″ is the standard height and to give them the flush appearance they moved the compressors to the bottom to allow for a seamless venting appearance. I do agree the shelfs on all of these can be quite tall. Unfortunately this is part of the design,.