Before you spend your money read lots of article and learn about what others have done. A good place to go it http://www.nagca.com
There are lots of technical articles and reviews on accessories and aftermarket goodies for the Grand Cherokee. There is also lots of photos and info on Project98ZJ from street rig to trail machine. They also have a Forum that covers everything from lifts to high performance. Your best bet is to read, visit forums like this one and obtain as much info as you can before you start handing out your hard earned $$ When you are ready NAGCA has a link page that covers most of the major suppliers and vendors.
The Grand Pooh-Bah