Mike, I'm "dining room" racing. It's the type of track you can have when the type of wife you have is an ex-wife. 
I'm a hoarder, and have hoarded many different things in my life. Luckily I don't suffer from separation anxiety
, and usually sell off my old obsession to pay for my new obsession.
I bought literally hundreds of HO cars in early 2K. Mostly 440x2 NASCAR, and JL T-jet and X-traction cars. I sold most of them the last 2 years to finance my latest hording disorder infatuation, vintage 1/24th drag cars, but I still have a lot. I got tired of listing them on eBay.
Cars I have ready to race.
Aurora T-jet small tire. Brass wheels with narrow silicone tires. This is what I started with and have had lots of trouble with. I think I know how to fix them now.
JL Fray cars. Working great.
Tyco 440x2 NASCAR. I still have a lot of them. Saving those for when the kids learn to drive.
440x2 trains. I have more than 10 of them complete. Back in the day I planned on having races at my house with them but never did. 4 of those going around the track at the same time seems like it would be a blast. Or a disaster. I'll eventually find out.
Cars I can race.
Aurora big tire Indy cars. Aurora T-jet with large diameter, narrow brass wheels with large, narrow silicone tires. I only have one built that I raced locally, but I have enough parts to build 3 or 4 more.
I had a bunch of G-jets with spare parts and tools that I got a with a used MaxTrax track I bought. But I sold those, and the track, to buy vintage 1/24th drag car stuff. I still have one G-jet. I can't say I like it all that much. It's still got a lot of magnet down force. I like slippin' and slidin'.