I like my 4 cyl but it's what you want that counts. Offroad there is little differance in the 4 and 6 unless all you want to do is throw mud. I do trails, rocks, and hills and the 4 will go where I point it. 200k is a lot for most motors and a Jeep 6 can take it DEPENDING on how well it was treated. I would be shy of it unless I knew the person who had owned it and knew how it was cared for. With all used Jeeps you need to know what your looking at and 5K for a 99 is a good price, maybe to good. Are the any modifications? Any signs of it being offroaded? The place to look for is the underside, things dented or bent, fluid leaks, etc... The 97 4banger seems a little high but it could be that it's never been offroad and was treated like a princes. You just never know. Good luck and some pics would make things easier.