I just bought a Canon S900 and use it to print photos that I ALWAYS open up in Abobe Photoshop where I color-correct/sharpen/crop them. Should I leave these images in RGB (camera) format or should I convert them to CMYK files for best quality printing? I am using a Canon S230 camera.

Also, can I use Epson high quality photo media with my Canon printer and get comparable results as I'd get with the Canon media? Seems like Epson has a lot bigger selection of papers.

Appreciate any advice... BB