I am planing to get two GTX 780's for my build. Which card would be the best for airflow and build quality? It looks like the non-reference MSI and ASUS coolers would move a lot of air, but i'm not sure how they would run in SLI. Would it be better to get a reference cooler? I have never had a card that had a heat sink like these, so I have never had the chance to see the differences. Any help would be appreciated.