Ok, well here is a version where I cleaned up the back a bit then. Yeah, I guess I was going overboard. I totally forgot about that I could use the magic wand/paint bucket tools. 
http://www.box.net/shared/e1on0bgcnv
I was curious and took a quick look at it. Couple points.
1. Noticed some moire effect on the logo on the spine, back and the front cover.
2. The KOEI logo on the spine has some black on the border. What i suggest is right clicking the layer
Blending Options > Color Overlay > Whiteand that should make it completely 1 solid color.
3. Since the magic wand doesn't get all of the back black click on
Image > Adjustments > Levelsthe left tab adjusts the darks the right tab adjusts the whites and the middle controls the balance. Just adjust the left tab a few points to darken up any areas that require it eg. the middles of letters like "o" "e" etc etc. The right tab will bring out the whites in the barcode area and patents box.
Or you can do what a few of the guys and I do, and just retype the back.
