RT
The "formula" penalises cars with forced induction, engines over two litres (the minimum calculated value), and takes into account the distance inside the car to the backseat. Taking all of these into account, I'd suggest that the R5 will not do well, but that the cavalier might be excellent if you get a 2wd GSi 2000. The FIAT sounds a hot tip, if you could find a good one.
Duncan