I don't have aperture -- I'm one of the unwashed masses who still use a PC with Windows
, so I can't give specific advice, but what I would suggest is using DPP to find a Picture Style/adjustment that you like then pay attention to the details in DPP. The adjustments in Picture Styles and other things brought from in-camera settings are pretty basic: White Balance/Color Tone, Contrast, Saturation, Sharpening and maybe Noise Reduction are all part of the image parameters that can be seen in DPP and replicated in other Raw processors. Once you understand what DPP applies, it should be pretty simple to apply similar adjustments in Aperture to get things reasonably close and then save your own preset!