I personally don't think you need to go long arm until you get to 6" or so. You can get plenty of flex out of 4-5" of lift without long arms and if set up correctly will ride nice on the road.
For 3"+ adjustable control arms are a good idea, but plenty of people use the stock arms at 3-4".
At lift heights that long arms become more required, 6" or so, I think you will start to have some other issues anyway, ie: front driveshaft angle at t-case, balancing caster and pinion angle, steering, etc.
You'll likely find that even with just 3" of lift there is a good chance you'll run into issues with the front drive shaft, in particular the slip joint boot catching on the tranny pan, and the CV boot at the t-case end wearing and/or splitting.
If you go with an aftermarket front driveshaft then you will need adjustable control arms in order to balance caster and pinion angle.
You don't say if it is a 2 door or 4 door, but for a 4 door you'll want more lift for playing on rocks than a 2 door.
There is no real difference in terms of lift whether it's it a Rubi or not.
There are plenty of good lift kits out there, I like the Poly Performance kits as they have thought through everything and address all the important geometry issues. I've been impressed with the Full Traction Ultimate 3" kit as well. Although very few seem to use it, I like the looks of the Rancho long arm kit also.