You are correct, James Duff has a 3" kit, which comes in Stage 1., 2, or 3. But they they have a 5.5" kit also which only comes as a stage 3. The price is comparable to skyjacker. Personally both Skyjacker and James Duff have the best brackets. There are plenty of people on here running either of those kits so hopefully they will chime in. What is nice about the James Duff kit is they are really intune with what alot of people are using their trucks for. They have alot of parts out and coming out that will allow people to do SAS easier. The coil buckets for their Kits will allow the use of early bronco coils as well as RBV coils. I'm going to be putting a JD 5.5 stage 3 on mine very soon, so I'll let everyone know.
Steering was mentioned by 4.0B2. That will definately be an issue. I'd highly recommend looking into the Stone Crusher Steering system. Call Anthony and talk to him about it, he was always glad to answer any questions or concerns I had. Mine was about 345 shipped, installation took about an hour then a good alignment. It works great, a substantial difference from the stock setup, in my opinion...the best kit available at this time.