The tags at MVD are a percentage of depreciated value (ie they go down each year). Not sure exactly what year/options your rig is, but even $600 is high for a Wrangler, unless maybe you do the "renew 2 years at once instead of just current year" thing (they give you the option to do that). I dont remember exactly what I paid when I bought in September, but I want to say somewhere in the mid-$200-300ish range give or take. I could be wrong but I dont remember being ridiculously offended with anything even close to $600.
2014 JKR Granite Crystal, 5.13 Auto: RK X Factor 2.5 Inch Lift, Artec Front and Rear Truss, Artec Rear LCA Mounts/Skids, Poison Spyder HD Crossmember, Rock Hard Gas/TC/Evap/Oil Skids, Rough Country Diff Sliders, Nitto Trail Grapplers 37x12.5x17, Pro Comp 97 Series Wheels, Synergy Weld On Rear Trackbar Bracket, PSC Hydroassist, T6 Aluminum Tie Rod, G2 Gold Chromoly Axle Shaft/RCV front axle shaft, Dynatrac Ball Joints, 1310 driveshafts, Artec Rear Upper CA Mounts, Warn VR8000.