well here is my collection (pics will come later im just too lazy to take em and upload em to my hosting site)
Kenner talking KITT with figure: got this for 20 bucks back in 97, it NEVER had a batter in it for more than a few minutes at a time. the plastic is flawless, shiney, and except for one MINOR scuff near the the roof by the rear window its scratchless, the windows are fog free RARE for a 22 year old toy car

Michael is mint except for a minor chip in the paint on the tip of one of his boots.
1/18 scale KITT: but i filled in the recessed areas on the rims with a fine tip black marker and cleaned off the excess for a more accurate looking wheels. and i replaced the rear plate decal with one i made (looks like the one in my avatar)
2 KITT models: one is a MPC original one from 1983 SEALED and one is the reissue kitt, except i found a opened MPC KITT on ebay that i scavenged the body for the correct fender scoops that are missing from the reisssue, the reissue kit supplied everything else
1 Knight 4000 model: original issue with grey background on box art not the blue background on the reissue which has the wrong rims/tires (corvette rims instead of the 5 spoke aftermarket ones on the original)
Hotwheels of japan KITT: MINT ON CARD
Knight Rider: The Complete First Season DVD: NUFF SAID
Knight Rider: The Game for PC: got it NEW for 9 bucks in the clearance section
3 of the Knight Rider paperback books: First one of the pilot, trust doesnt rust, and hearts of stone
Thats all for now, i plan on getting season II in april, and maybe ill get the AMT diecast of KARR when he comes out, as well as the hotwheels of japan KARR too