That's a tough call.

I don't know why that Asus card is so overpriced, it's just a regular GTX 780 like the others you have linked. After the recent release of the 780Ti, all of the regular 780s went down to $500 (at least they should have). According to Newegg, the card looks to be EOL and discontinued, and I don't know why Walmart hasn't dropped the price on it like it did to the others.

Is there an extremely soon deadline that you need to make this decision by? If not, I'd say maybe try and wait it out a week to see if any EVGA 780s come in stock or if that Asus card drops in price. I know that Zotac and PNY have both been around for some time now, but other than that, I don't know anything about them or the quality of their products.