FYI, I have found that the K270 Kenda is very, very air sensitive. A buddy has a K270 on a DR 650 right now. He finds that about 28 lbs in the rear tire does away with most of the squirrelly behavior on pavement. I played with it a bit Saturday, going from about 35 lbs in the tire, gradually dropping down to 25 lbs, and the air pressures did effect asphalt handling dramatically. Still not a desirable ride for me, it did help stabilize the bike, enough so that the tire didn't distract from the ride.
There are too many variables for anyone to recommend the "perfect tire". What worked Saturday on semi-moist trails and dry asphalt may not be worth a tinkers dam the next day on the same surfaces following a hard rain. A lot of trail success has to do with the rider being able to manipulate the bike with the tires it has on it. Meaning, you can't buy your way into a higher skill level. That requires hours in the seat. Any of the tires you mentioned will be more than adequate for entry level, "won't be difficult" trail riding a noob will encounter. The Shinko 244 front and rear will get you up and down "won't be difficult" trails, allow you to stick to any asphalt situation you will encounter. I have over 30,000 miles on the 244's, running at 75 MPH for considerable distances, with no issues. Keep in mind, knobby type tires are prone to chunking. They sometimes throw knobs, regardless of amount spent or manufacturer. Shinko will stand behind their tires 100% if you throw a knob. Their warranty is second to none. Regardless of wear, age or miles, if you have a Shinko tire fail for a manufacturing defect, they will replace the tire at no cost to you. Short of supplying you with a chase vehicle, it does not get much better than that. The best news is, I have never needed to make a warranty claim. As far as longevity, I am averaging 6500 miles out of a rear 244 tire, with some "meat" left. They are too cheap to run down to the cords. I did just remove a 244 front tire that has 14,000 miles on it. Never balanced. Thats a lot for a tire I spent less than 25 bucks for.
And I don't travel light.