I believe with Lightshop you can tie it into PS somehow. With Aperture if your on an Apple you can get and Workflow Action Pack that you can use some of Adobe PS actions within Aperture. I had it with Aperture 1.5 but going to find out what I did that it won't work in 2.0, may just be a minor screw up on my side or I may just need to redo it.
Aperture also offers a full 30 day trial for download, how I choose when I did, downloaded both and gave them both a try side by side.
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