I used these guys' plans to build a BASIC, yet cost effective, racing setup.
Works great, but hogs some real estate in the basement.
The seat, along with the wheel, pedals, and shifter make up most of the cost.
They take their racing a little too seriously for my lifestyle, but they are absolutely awesome at what they do!
Regarding the spinner: Tron, And Forgotten Worlds are fun spinner games, but it is with Ivan Stewart's Off Road franchise where my spinner shines as a steering wheel (one player only of course). Arkanoid is the main reason why my spinner is in the dead center of my CP. I haven't yet figured out how to get a good 2600 emulator going but once I do, I really like to play some Kaboom!
Regarding the trackball: There is Missile Command, Crystal Castles, and some bowling variants. The golf games are also great and an uncountable number of Golden Tee's.