This Intel Z270 / 7th Generation Intel CPU / DDR4 RAM Bundle Configurator lets you pick matching parts for a system core or upgrade.
Use Promo Code "LGA1151" at the checkout and you can get $22 off the total price.
You'll need to add a LGA115x-compatible CPU Cooler if you pick the 7600K or the 7700K, as they do not come with one.
The boards included are full-size with room for expansion cards, so you will need a midi-tower or larger case.
You can add a Corsair Watercooling system if your case has suitable fan hole at the back.
You'll need a power supply with both 24-pin and 8-pin ATX power cables for the motherboard.