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Depends how much you want to spend, and whether you want manual or motorised.
You can get wheels with 4, 5 or 7 filter slots, and with 1.25" or 2" filter slots.
For planetary, you only need 1.25" slots, and you only need the 4 or 5 slot one, for IR, R, G and B filters.
In terms of manual wheels, I've got the Atik one which appears to be the cheapest/best value for money at US$199. You'll need to include a bit extra for adapters.
For motorised wheels, I can't comment on the makes and models, except that the Andy Homeyer one is apparently the cheapest at US$499. Quite a few people have and use this quite successfully. You can spend a lot more on other motorised wheels. Gary Beal recently bought one and might be able to offer some advice.
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