The atom comes in supercharged and NA forms just to let you know.
The supercharged version is SERIOUSLY quick and will eat pretty much anything on road and track.
The radicals, although road legal wouldnt be as much fun on the roads due to ground clearance.
Others to consider are the Caterham R400/R500 and the new Caterham CSR - cosworth powered - all about the same sort of level as the atom.
If your dad has never driven anything like this before i would definately recommend the lower powered version for a few years before moving up
