We have one of the basic types that fits on the bottle and diffuses as it pours. It works well but the issue is forgetting to dig it out and attach it before pouring. Haven't used it in a bit because it's easy to just open the bottle and pour.
If I ever replace it, I will likely get a decanter/diffuser combination.
Either way, I would got for the middle, not the cheapest but not the priciest. Checkout Wine.com, Wine Enthusiast and Amazon.com, and look at ratings and reviews. You could also go to Spec's and ask for a recommendation.
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