Motorchamp is a lot more expensive, but you can build 12 different tracks out of the three double sided board pieces. It also has far and away the best cars of any of the games. If you bought Formula De and 10 more tracks, you'd end up spending more money than you would on Motorchamp, though the FD tracks do have more variety and depict actual race tracks. Both games involve rolling the dice and moving your cars, but I find Motorchamp plays faster and has about as many significant decisions as Formula De.

Das Motorsportspiel (also known as DTM Hockenheimring) is also very good. The dice rolling mechanism provides some control over your car's movement, as you may flip the dice over to the exact opposite side of the one rolled. The timer, which is not provided with the game, really makes the difference. All decisions must be made under the time limit. Failure to roll the dice, make any changes to the dice and move your car in the allotted time (usually 30 seconds) results in a time penalty. Of all of the racing board games, this one provides the best "feel" for being in a race. There are three tracks available for the game.

Top Race / Daytona 500 use a card based movement mechanism. I believe Top Race is still in print. Daytona 500 is out of print but can be found pretty regularly on eBay for a pretty low price. The card play requires players to move all cars, not just the ones they own. The trick is to give away as little as possible to cars owned by other players while maximizing your own car's movement. This game plays quickly and is a lot of fun, but it's not an accurate racing simulation game. I prefer the Daytona 500 version, for what it's worth.

Speed Circuit from 3M and Avalon Hill is out of print but, again, readily available on eBay. There is no random factor in this game at all. Cars are rated for acceleration, braking, top speed, starting speed and wear points. Each turn, players set their speed based on the car's ratings and their position on the track. The game comes with three race tracks. It's old, dating back to the 1960s, but still very good. Formula One, from Waddingtons and Parker Bros, is very similar to Speed Circuit, though it has a bit of randomness built into it. Formula One is also readily available on eBay.

Pitstop is an Italian game that I've never played but would like to. Unlike the other games, it comes with track pieces that can be put together to form many different tracks. I've heard good things about it but haven't been able to get my hands on a copy.

Which of these would be best for you depends on exactly what you're looking for in a racing game. I listed them in my order of preference, for what that's worth.