I no longer have racers in my house (used to at my old house, guests loved them) but I've sold hundreds of them, and too many of them I personally delivered/set up. Nothing like delivering with the understanding of putting them in a garage or first floor to then be told when you get there before payment, "oh, we decided we NEED them in the basement." I can't believe my back still bends; I'll probably be paying for it later in life.
Having a pair for most titles is key. Games like Hydro Thunder, Cruis'n USA/World, California Speed are all over the place now and relatively cheap. If you want a newer game like H20 Overdrive, Dirty Drivin, NFS Carbon, etc...break out the wallet because most of the few that were sold are still being held onto/operated since there isn't much better.
Beware some of the early Global VR and Chicago Gaming (Nicktoons Racing) games...cheap cheap parts in them.
Chris if you're looking for something else specific let me know, I come across these games all the time. Moving some Sega Race TVs and Mario Kart GPs in a few hours, actually.