I had great luck with my RC 3 inch lift up front. After four years of hard wheelin' I added a winch and bumper, and they'd had enough.
I went with the add a leaf in the rear, and have to say that my already shot leafs didn't fair well with the add a leaf. I ended up going the Dakota leaf route. I'd say go for the full leaf pack, or plan on doing something different in the rear sooner than later.
I had a few vibes before dropping the t-case, but each Jeep is different. The front brake lines once I moved the mounting point down were long enough to still work. But I'd be sure to check the rear line, I changed that to a Dakota rear line also.
I ran 31's and trimmed the fenders and rear wheel wells, but more bump stops would have worked also. But why limit the up travel? The only issue I had with rubbing was because I had stock rims. The back spacing was wrong for the 31 10.50's.
Over all the RC 3 inch kit got me started and was a good kit to start with until I learned more about my Jeep, and what I wanted to do with it.
DAryl