Duratracs are a really good tire. I would say it seems to be the tire of choice on the forum these days.
The 225/75/R16 size will fit fine on your stock KK. I'm currently running a set of Cooper Discoverer A/T3's in that size, that I got about a year and a half before lifting. They are aggressive enough looking that they don't look too bad under the 4 inch lift. Keeping the stock tire size, I am still getting close to stock gas mileage too.
My next set of tires will be Duratracs, but now that I'm lifted I'm going to be looking at the 245/75/R16 size. This size is too big to fit under the stock suspension and still have any room for articulation, but with a lift it will be good. Many lifted LOST members run this size.
If you are not planning to lift for a while, I would say go with the 225's now. But if you think you'll have a lift within a year or so, and your current tires are not dangerously bald, I would say to hold off and buy the 245's after lifting. Let's see what other people say too, but that is my

.
_________________
2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997