None of those. You want a mini PCIe card, not a PCIe card.
This is the product:
Intel Dual Band Wireless-AC 7260, model number 7260HMW. You don't want 7260HMW-AN or 7260HMW-BN as they don't do 802.11ac. The plain 7260HMW has 802.11ac support and the card has a text "Wireless-AC" on it whereas the other models say "Wireless-N". The antennas you need to check with Akasa - no idea of how their cases are delivered, with or without antennas.