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Let your budget be your guide, as there are a ton of options.
Are you planning to stick w/ the factory head unit?
If so, then you need to pick a pair with 2 Ohm impedance or the effective volume will drop accordingly (4 Ohm speakers would reduce the output by half, 8 Ohm speakers would effectively reduce it by 75%).
Adding an amplifier (or an alternate head unit) can help overcome this issue, but like many things H-D, they did this on purpose.
Check out Crutchfield.com as a good starting point.
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Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
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Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
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