There's a number of variations to the Kenwood 9, 10 and 11's. The 9's and 10's only have knobs, whereas depending on which Model 11, it either has knobs or eq sliders.
One bit that's often asked about is what's the difference between a G and a GX - in looking at 2 side by side (an Eleven G and GX), the only difference a friend and I could come up with was that the G has a solid wood case, while the GX has a veneered wood case - that seems to be the same for all variations of the G vs. the GX. Both the G and GX were only offered through military exchange.
Nine (silver)
Nine G (silver)
Nine GX (silver)
KR-9000G (gunmetal)
KR-9000GX (gunmetal)
KR-10000 (same as the Eleven, champagne/bronze color)
KR-10000 II (same as the Eleven II, champagne/bronze color)
KR-10000 III (same as the Eleven III, champagne/bronze color)
Service Manual here
Eleven (silver, knobs)
Eleven II (silver, knobs)
Eleven III (silver, knobs)
Service Manual here
Eleven G (silver, sliders)
Service Manual here
Eleven GX (silver, sliders)
KR-11000G (gunmetal, sliders)
Service Manual here
KR-11000GX (gunmetal, sliders)
Super Eleven (gunmetal, sliders, digital display)
The all have a classic Kenwood styling - same dial face as the KR-x600 line. The tuners on these are quite good as well. At any given time, there are often multiple variations available on eBay - though if you're looking for a specific model, you may have to bide your time a little. The gunmetal versions are certainly rarer, with the 9000's being the ones I've seen least. I love just about all of these models, though my favorite is my KR-9000GX that's pictured at the end of this post.
Not sure if you wanted all that info or not, but I get pretty stoked about this line of Kenwoods.
If anyone has manuals for any of the units not already in the AKdatabase, certainly scan/email them in!