I think a combination of the two would be best actually. I would do the RC 2.5 to give you more capability off road. But I would also add a BB to the front to level it out too. Depending on how much front end rake (every jeep has some to begin with) you have from the added bumper and winch is how much of a BB I would add in the front.
The easiest way to determine how much front end rake is to simply get a tape measure, measure the front and rear. Then determine how much of a difference there is in height between the two. Since you have a winch and an after-market bumper, I would guess that you would need about a two inch BB in the front to level it out.
hope it helped,
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