I would say this depends on how many cars you plan on building initially. The first on my list would be a Dremel and have John drill the bodies initially. This way you would have some extra budget money to purchase weight, axles and wheels. Once you have these items and want to step up your game, then buy the "Silver Bullet" but you'll need a drill press. The Proxxon is a popular choice. Goat Boys new drill fixture may be an option too, if available. Of course, in order to drill you'll need some carbide drill bits, once you have the other items to drill your own bodies.
I think once this is all in place, expand your tool inventory, this will depend on how addicted you are as to what you choose to buy. Just my 2 cents.