There are a few things to consider here. One of which is your budget. I am fairly young, I have had my drivers license for 14 years and have owned somewhere around 25 vehicles. (I can't remember the exact number, mid 20's anyway.) I have never made money changing or adding vehicles to my fleet. In fact I have only lost money. If you go with an older Jeep, you will have a vehicle that is cheaper to fix, so you feel you can drive it harder, but the cost of purchase and then the cost of building it just to match the capability of your jku, take it from me, you will loose money on this deal. And, with an older Jeep you will have constant repairs. Your jku is paid and has very few repairs at this point. You already have spent money on your jku, yes? Instead, invest the money that it will take to build a TJ into what your jku already can do, and put it into the junk you already have. And, because its a 4-door, you can take your family along with you which is more important than any of it really. You will be further ahead continuing on your current path and to continue to focus on your current project. You will have more Jeep per Buck in the end if you keep what you have. Just sayin' is all.