Oh.. and your final image size should be around min 22 meg (8x10 @ 300ppi) minimum for a print that size. Though larger will be better quality.

As Sean said.. you will want to scan it at the higest resoulution possible for minimal loss in image quality. For my larger printed works I have had files in the range of 250 - 500 meg as uncomprssed .tiff's. Just to give you an idea.. the 500+ meg ones were for prints in the 20x24 size. These are drum scanned 4x5 negatives/positives. I know it might seem tedius to scan at that high.. but it is needed for good print output. Web ouput can be much smaller.

I think he was refering to the look of an uncropped 4x5, or 8x10 contact print. With the three color bleed on the edges that sometimes occurs. I am not sure how to create that effect myself with Photoshop.. heh.. I still do those the old fasioned way.. with a darkroom.

One warning.. don't use the on camera flash with a wide angle lens.. you will get light vinyetting occuring. I have 2 10D's and discovered the problem doing some tests 2 months ago using my 17-35 f2.8. Also it is not compatable with my 540EZ's or my 480EG. I had to purchase a new 420 EX Flash for it. Oh.. you might also concider getting (if you have not allready) the BG-ED3 Battery Grip. They hold 2 batterys (for longer shooting times in the field), and the virtical grip shutter is invaluable for quick compositions in the field. For my system I have the grip for both bodies, and carry 6 batterys. This way when I am on a shoot, I always have back up bodies, and batteries.