I recommend the SYE and CV shaft in favor of the TC drop... But it is up to you and what your budget is (budget and Jeep in the same phrase??? Something does not sound right!!!).
I have never ridden a Jeep with Rough Country, so dont put too much weight on what I am going to say, but I have read in other forums that they are true to their name (especially the ROUGH part). I have Rubicon Express, and I am happy with it, but it is still a rougher ride than the stock ride (the more arch the springs have to achieve lift, the rougher the ride will be; this is unavoidable!).
Now, as to what else you HAVE to get (if not included in the kit):
Dropped Pitman Arm
Things I RECOMMEND to get:
New brake lines
SYE Kit
CV Shaft
New perches (to correct the axle angle for the CV shafts)
Felipe