I've used both a SRAM PC-1110 and a Connex 11SX-- that's a $14 chain vs. a $70 chain. The Connex was a little quieter, and the shifting stayed smoother a bit longer. Did it last long enough to warrant the disparity in price, or perform better in any measurable regard to warrant said price? It did not. I mean, it would need to last 5x as long to beat the 1110 on $$$ per mile alone.

Chains, as with anything else, have a sweet-spot in price where going below saves you a few bucks in exchange for a little more weight and a lot less bling, and going above costs you a few bucks (or more) for a little less weight and often a lot more bling. So I just generally stick to the chain that matches the cassette. Buy a 6800 cassette, get a 6800 (or HG701) chain. Same for SRAM 1170, 1190, whatever. A very good chain can be had all day for about 35 bucks. There aren't many other parts that last as long, while doing as much work, for as little money. But if I'm riding in the mud and muck, I don't hesitate to pick up another PC-1110. They're so cheap they're nearly disposable.