I just installed the JB4 and I believe it's worth doing, it adds a lot of torque that this big vehicle needs - definitely helps from stoplights and passing.
Alternative would be something from MHD which flashes your ECU and doesn't just piggyback. MHD may give more control and I believe it is more well regarded for heavy modders, but I could be wrong on those points.

Per my research I believe the performance intake is a waste of money, unless you want the increased sound. Seems to not give much benefit over a drop in performance filter.

VRSF charge pipe would be a good upgrade, I believe the stock pipes are prone to breaking under higher pressures. I'm not sure it give much power gain.

The next big thing would be a catless downpipe, but then you are talking emissions issues and increased sound/smell from exhaust.

If you are unhappy with the shifting of the transmission in normal or sport, you could get xhp transmission software, but I'm thinking I'll do that last after all of the above and a turbo upgrade.