Maybe we can help here...
We are a dealer for both RK and TF. We dont carry MC but they seem to be a nice setup from what we have seen...
Like you said, when you add the trackbar and things, the RK 2.5" X Factor and TF lifts will all new arms are about the same. There are a few differances though.
TF runs a linear spring front and rear. RK runs a progressive front and a linear rear. The progressive is nice because it will hold weight better and also give you a better on road ride. Also, the RK coils are going to be longer netting you more lift than the TF will.
The RK arms are also a bit heavier than the RK's. They run a solid arm.
Install wise, they are both about the same. I would recommend doing a exhaust spacer with either one.
Now for shocks. I like the Fox's over the 5100's. They are a bit more, yes, but you get more out of them. The 5100's are steel and can rust. The Fox are aluminum and will not. Also, the Fox's are rebuildable and revalavble. Something the 5100's are not.
One of my personal favorite setups out for the JK are the RK 2.5" and Fox shocks. That is what we run on our 07 2dr and it flat out works!
If there is anything we can do to help or if you have any questions, feel free to PM, email, or call us at anytime!