Welcome dude!
From our perspective, these are the interesting items:
Up Country Suspension Group - Big whoop... an extra inch taller.
Dana 30 Front Axle - On a 2000, the D30 has a low pinion. Less ground clearance.
Corporate 8.25 Rear Axle - Of the two stock axles, this is the stronger alternative. It will hande larger tires and does not use c-clips. Each axle shaft is the same length so you only need to schlepp one spare.
Anti-Spin Differential Rear Axle - Limited slip uses clutch packs which eventually wear out.
Delete Rear Stabilizer Bar - Saves you the trouble of having to throw it away yourself.
Trailer Tow Group - Rear tow point. Carry a hitch pin.
Tow Hooks - Front tow points. Carry a 30' 2" snatch strap.
Fuel Tank Skid Plate Shield
Transfer Case Skid Plate Shield
Front Suspension Skid Plate
The transfer case skid is so-so. If you plan on rock crawling, you may want to change it for something more heavy duty. If you never plan on leaving a dirt road leading to your favorite camping/shooting sites, don't worry. The front and rear skids are fine in all circumstances unless you have purple bumpers.
http://www.naxja.org/forum/showthread.php?t=84046