Best reader for Scientific American Digital

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Hello,

I subscribe to Scientific American Digital, which makes issues available in PDF format.

I own a few Kindles, including a Kindle 2 (which can display PDF files).

I do not own a Kindle DX (which has a larger screen).

I seek a good eBook reader for the SciAm PDFs.

While the Kindle 2 is great for novels, the screen is too small to effectively display the SciAm PDFs.

Has anyone used an eBook reader to view SciAm PDFs, that does a good job?

How about the Kindle DX?

Color would certainly be a plus, but I could live without it.

Thanks