That's cool! I thought those looked like Micro Machines - I used to have a ton of those, but I kept only a few - mostly my aircraft carrier and full compliment of jets and bombers. I only kept a few of the more exotic cars - never had any mopars.
I have an HO set but have nothing set up (I don't have the time or money to put into that) but my mom has an AMAZING O scale setup - she has a Lionel set they purchased around 1990 for just under a thousand dollars - $1,000!!!! - this past winter dad had it appraised - over $3,500!!!!!! Her setup is pretty impressive because not only is it only about 8x10, but has a TON of buildings, skating rinks, even bridge-over-water landscaping that my dad built by hand, but it also wraps around the Christmas tree every year, and gets taken down and set-up every Chrstmas season. She puts DAYS into setting that up every year, and every year it gets better. She has spot-lit buildings, lighted Christmas trees, wild animals and domestic pets scattered everywhere, and buildings that are oriented to the interests of her children - a "State College" building from my days at PennState, and a Radio Station from my music days - also a Navy office building for my brother and sister, and of course the hand-made Church with real stain-glass windows that my great grandmother made decades ago.
Jeff