Kayaking Technique Forum

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Whitewater x-training, river running boat choice?

I am planning to get a whitewater kayak to use for sea kayak x-training and river running( I live 5 hours from the ocean, but 5 minutes from a river). Since some of the people on this board kayak both sea and whitewater, I'd like advise on what type of boat to buy. I am trying to choose between a river running playboat with a planing hull (Wavesport Z, Dagger Outlaw, etc), or a longer older style displacement hulled boat (Dagger Crossfire, Animas etc).
Any help appreciated, Richard.