I had been using the Water Resistant line of Canon's canvas, and just had a custom profile made for it. It cost me $25 from Inkjetart.com which is super cheap and it was indeed quite nice. Can't really compare to other profiles or even other canvases, but the custom profile was way closer than using any other paper choices and trying to do spot adjustments. I was only a bit dissapointed that shadow detail just wasn't there, but this was a result of the canvas, not profile. So I say head over to the website, download the targets for the thick media and send them off. When you get your profile emailed, your troubles will be over.