It all seems to hinge on color really. And there's no color readers, but, I've viewed Trigun on a couple of readers, and I dug up these reviews I used when hunting for my just purchased reader, I currently view comics on my UMPC and find that perfecty satisfying.
Here are the links:
http://ebooktest.blogspot.com/2008/1...or-iphone.html
http://www.teleread.org/2006/09/29/m...ader-a-review/
http://www.teleread.org/2008/07/27/t...three-shadows/
http://www.teleread.org/2008/07/15/f...ell-in-august/
(I have to say, if that Fujitsu reader makes an appearance I'd be tempted, love their computers)
I know its not much, but maybe it can help a little. Good luck!