An iPod touch makes a perfectly capable eBook reader as long as you're okay with the screen size. I can read fairly comfortably on my iPhone (and it's a 3GS so the resolution isn't even as high), and there's no doubt that it's more capable as a general use device than the nook color (assuming you don't root the nook color).
Ultimately, it really comes down to personal preference. (I seem to say that a lot) I find that I would personally go for an iPod touch over a nook color, but at the same time if you are comfortable with rooting the nook and your needs can be fulfilled by it, it would be a great option if you do a lot of reading.
Due to the fact that you already own another eBook reader though, I'd recommend the iPod touch. You can get the general use out of it much more easily than a nook color, and you already own a reader that has a comfortable screen size for long reading sessions.
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