Why do you want the ones that will take the most power? You know, just because one particular set will take the most power doesn't mean it will be the loudest with that power.
The JBL GTIs are usually considered to be very receptive to lots of power. Some have also said the Boston Pros can take some power. But I know for a fact that the Focal Utopia 3 Way set will handle a good chunk of power and put out quite a bit of sound in the process. If you build a set of sealed enclosures (either kick panels or in the doors) most sets will take more power sealed than IB.
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