Since RTR radio gear is out of the picture... the Hyper 7 would be the best all around choice.
Mega parts avaliability,hop ups galore, and the PBS starter box are reasons why.
The Jammin would be second choice as it is probably the best on your list for the track, but would still cost more and you would'nt get the starter box included.
The Mayhem is a good car as well, but there is far more good setup info availiable for the Hyper.