Any 8s chain will be fine. You can stay with a Shimano chain, or possibly save money with a comparable quality KMC chain. (KMC makes many of Shimano's chains)
IMO the best value in chains is in the middle of the product range. Each makers best chain is better than it's second best chain, and so on down the line, but near the top the cost differences are much greater than the functional differences, so I buy the 2nd of 4 models, or the 3rd of 5 or more.
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