I would recommend against the E.T. I liked the unusual flare of it myself when I first discovered it. I bought it and have been disappointed. It is really all show and no go. It is awkward to operate, can be uncomfortable where the ribbing rubs against your finger, and is likely to cut you. This is by no means a criticism of Kershaw as a whole though. With the exception of the E.T., I love Kershaws. Just stick with the Ken Onion line.
The Cyclone seems to be a good mid-grade knife. It has a solid design with good quality components, and is an assisted opener. On thing to be aware of is that the toggle for turning the assist on and off has a tendency to fail.
Another knife in this class, that I have not seen mentioned, is the Kershaw Blur. It is also assisted, about the same size, and has a very usable design. My only criticism of the Blur is that the Trac-Tec inserts are overly abrasive, like grip tape on a skateboard.
I have an Endura 4 Wave on the way right now, so that tells you what I think of it. It has a high grade blade steel, full steel liners for strength, FRN scales for grip, that great Wave feature, Spyderco quality, and a great price. You can't go wrong.
The Ti-ZDP Leek is very popular, it is made of top of the line materials, and has a frame lock, which is the best available in my opinion. I understand that they are not easy to come by though, and if you do find one, NOT cheap. They are also a rather small knife. The leek is a popular model, so you should be able to find one in a store. If you think this might be the one you want, I would recommend handling one in a store just to get a feel for its size, but buy online, you will spend much less.
If you do like the leek, but can't find or afford a Ti-ZDP, there are other trim packages available. The base model has a 440A blade which is just fine for the level of use that a knife that size is intended for. If you want something better, there is the S30V blade. S30V is a high grade steel and will retain an edge better, but remember, it will be harder to sharpen as well.
One other knife in this class that you might want to consider is the Benchmade Griptillian line. High quality blade steel, and available in two different blade designs, one with a thumb stud, and one with a thumb hole. They also have the axis lock which is very strong and easy to operate one handed.
Sorry for the long post, hope you find what you are looking for.