Dual band AC: best performance, but costs a little more than dual band N.
Broadcom BCM4352 802.11ac 2x2 Wi-Fi + Bluetooth 4.0 combo HP part # 724935-001
Broadcom BCM943228HMB WiDi 802.11 a/b/g/n 2x2 Wi-Fi + Bluetooth 4.0 combo HP part # 730668-001
You should be able to find either card on eBay in used but tested and working condition.
Search by the HP part number, not the model of the wifi card.
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