I had the same dilemma. I ended up getting the 7100 from Amazon on Monday. These are on Black Friday from the manufacturer. If you go to their website you will see. The sale price is until 26th I believe. I already own one that I bought 2 years ago (8 series) so I wanted another one.
You can do a comparison on the Samsung website and see all the differences. Sorry I am mobile now but if you need more info let me know and when I have a moment I will post and link everything.
IIRC the 7003 is on sale only at Walmart and B&H online or tiger direct (according to Samsung). The other you can buy directly from Samsung or amazon, or sears. I don't pay tax (for now) so it was an easy choice.
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