Like-for-Like or Options for Shimano CS-HG31-8?

OK looks like a couple of the rings on my cassette are worn! I'd had some small slips on one, replaced the chain with a new one at the weekend, and now one of the gears is unusable, and another is slipping.
I have Shimano CS-HG31-8 hub currently. Is it best just to replace like for like, or are there other options?
I have Shimano CS-HG31-8 hub currently. Is it best just to replace like for like, or are there other options?
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retired 9.6kg Carrera Kraken
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Thanks - I'll double check, but fairly sure it is the chain slipping. Also when I look at the teeth on that ring you can see they are worn compared to the others. I think I have a tendency to grind rather than spin as well...
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