Yeah, the plastic piece only really keeps dirt/water/leaves out of the area around the front differential. It's not completely necessary, but if you were thinking about running some armor, nows the time to upgrade! Think of it as a justified purchase.
I know The Steel Armadillo and 4xGuard both offer nice front skid plates.
2007 WK - Silver WK Club Member #71, 4.7L V8, 5 spd Auto, Autobot Decal (grfxedge.com), Aspen Creek Front Tow Shackles, Factory Tow Hitch
Check out more pictures and info here: www.mywk.tumblr.com