THis is what I do:
01 Import photos with ImageInjester (adds metadata, puts file where it needs to be, renames, make a backup & open images in Bridge automatically)
02 Edit images in Bridge: 1 Star to process, View only the 1 Star images, Select All & open in ACR
03 Save the images to an "Aperture Imports" folder
01 Drag the Processed images to a Project from the "Aperture Imports" folder, from Bridge or the desktop (This will import images INTO the Aperture Library)
02 Add Keywords & organize to your hearts desire, Print, export, add to Collections etc..
Aperture - Archiving
01 When "finished" with the final images > Export images WITH METADATA to an Archive folder of your choosing ( this folder is where your images will "Live" - NEVER to be touched from the desktop
02 DELETE the Original images from Aperture
03 Import the Archive images as REFERENCE back to Aperture
1 ACR is simply a better Processor (for my raw files, canon 1ds MKlll)
2 Aperture is the best I have used for organizing images (I've tried them all, & I'm not talking about downloading a 30 day trial software, actually using it for months)
3 Aperture has it's faults too, one major fault is not embedding the metadata IN the file, so exporting the images with metadata & reimporting takes care of that.
I hope in the NEAR future Apple will fix the faults with Aperture & then I can narrow down this workflow. Hope this helps.