Yep, most likely you just need either an adapter plate for the rear trackbar, or an adjustable track bar to make up for the lift.
The sag in the right rear is really common to have once the springs start to wear a bit. Out of curiosity, do you have a hard top on it too?
The Zone lift will do the job for you for cheap. However, even though you don't plan on doing a lot of offroading, the lift kit you choose will still make or break your street ride as well.
I have made the mistake of going cheap over quality on a lift kit before - and I will never do that again. Even if you have to save a little while to get something decent, you will thank yourself in the end. That's what I did so that I could get the Old Man Emu kit that I ride now, and the difference is amazing. Compared to what I had on my old YJ (I had decent springs, but ProComp shocks - and not the good ones) it rides like a Cadillac, with a crapload of flex
So, long story short, in my opinion you should save up and spend cash on the lift - and try to save in other areas.