Unless you absolutely plan on having the capability to overclock, spending extra on an overclockable z board and k cpu is a waste. Considering that h and z are practically the same price, going for a z board makes sense as they are easier to find and have a larger variety to suit personal tastes. Now what's left is OC. If you do not plan on OC then either a 4770 or 4790 or Xeon 1230v2 or 1230v3 is fine. All those cpus are very strong capability wise, and have no need to have any kind of speed boost like OC provides. If you must have OC capability then a 4770k or 4790k is what you want, but they do cost more.
OC is a hobby for mainstream cpus, it only more like a necessity for older generations that lack the power needed by current...