[Tongue Pirate]

ERA can be a kit in if you purchase the base car & build it yourself.

SPF is considered a turnkey minus be cause you basically add a Motor & trans.

FFR can be the most budget minded if you go the full donor route.

There are many other manufaturers out there & each are very different when you get into the details. As far as money is concerned it really depends on how you build the car. A FFR can cost more than twice as much as a basic ERA if you add a bunch of the goodies. The best thing to do is take your time & do some thurough research. You will be happy knowing you bought the right car for you!