Personally, I would stick to the RE kit. Also, keep in mind the issues with a SRS kit. First, a 2" lift sounds a bit high. Also, that's 2"'s to the front. You still have to level out the rear. Additionally, when you do a SRS, you change the articulation angle. No longer does the axle travle up and down, it moves at an angle that loves to eat your fender wells. Now, in defense of SRS (I use them), they do reduce the amount of shock that travles through the rig. Which results in a lot less wheel hop. So, you take the good with the bad. The fender problem is nothing a little metal trimming won't fix.
For your application, I would still go with the RE kit.
Earth First! We can wheel the other planets later