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About a week ago I heard Campy NA was about to get more Chorus 12 in stock. I'd go with Chorus 12 since it's a better value relative to the other groups and you might as well go with the latest thing even though Campy supports older stuff for a long time. I understand the 12 speed cassettes work on existing hubs. By the time you need a new cassette, Potenza will probably be 12 speed if you want to save money and don't mind a few extra grams. I don't believe you can do 53-39 rings with Chorus if that matters to you, but a 52-11 is only too small a top gear if you're getting paid to ride or close to that level. The ergonomics of the newer levers is really nice.
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