hey cndavguy thanks for the compliments. I'm highly appreciated.

Yes, the 60U and 600U are the same gen as the 9UK and share similar technology. The glass is the same as well. The 60/600U's have the ability to put out some blisteringly great PQ, like the 9UK's do. If you feed good video source via HDMI you'll get fantastic results.
Yes, as a matter of fact I have some SD-DVD movies screenshots on the 9UK, but from my laptop. The PQ on the SD is very impressive. Now that I'm using my HTPC it gets better. Ability to resolve details in the dark is superb.

smithster, no problem.. I'm glad to be your help. The Consumer models aren't bad at all. They also do have superb IQ and have great value. Nice thing about those is obviously not having to worry about purchasing a stand, speakers, and the tuner. They're all-in-one great product. But I personally like the look of the commercial models because they look so sexy, sharp, and professional.
Let's put it this way, you won't go wrong whether you have a 7UY, 8UK, or 9UK. All three are superb in overall PQ and performance. The 9UK does have improvements over the 7UY and 8UK but the difference in impression you will get is very small. If you pay attention to every single detail of the images wtih paused screen you'll start to see the improvments made on the 9UK i.e. slightly richer, and increased texture and deeper color depth. Also depends on the video contents as well. The 7UY and 8UK are neck-to-neck in PQ. In some of the HDs I do like the way my 7UY delivers in colors. It's just flat out beautiful, it really attracts me and draws attention while in other HD videos I like the 9UK better. The 7UY has slight red push while the 9UK seems to have a slight blue push. Different color tastes!

It is really subjective. But the improvment is improvement, can't deny that. The 9UK still edges out in textures and slightly deeper color tone.
People at the hitachi section are just making excuses. All plasmas are prone to have Image Retention and possible Burn-in images if the user does not take care of the product and abusing it. It's not the burnin you worry about, it's the PQ what you ought to go after.

As for the "Pixel Shifting", or "Pixel Dancing", it is likely driven by the video source or connection, not the TV. I had Pixel Shifting problem on both 7UY and 9UK with my laptop. The ATi X800XT and ATi X1950XTX in my HTPC gives me no pixel shifting. It is possible that whatever the video receiver they were using, might have caused the issue with the pixel shifting.