There's no reason to shop top of line. Any chain from the mid range on up in each manufacturers line will do you. After that more money buys less weight or nicer finish but not more strength.
BTW- depending on the rest of the chain's condition, you might be able to repair it by cutting out the damaged outer link and replacing it with a connector from Sram, Wippermann, or KMC. Just be sure to buy the right width.
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