The Hellwig hollow front sway bar is a good kit. You do NOT need to weld on tabs to the lower control arms. The hollow bar is lighter than the solid bars sold by other vendors. I would warn you against the less expensive ADDCO front sway bar kit — the alignment of the end links is poor, and the brackets are inadequate for the loads experienced.
Don't worry about a rear sway bar until you have tried a front bar. It will probably be all you need.