You can save yourself $100 right off the top of my figure just by buying a less expensive charger. I decided to just man up and buy the last charger I'll ever need which was $190, you can get a perfectly good and capable charger for $50-100.

You can save yourself another $100 if you are willing to either buy your ESC/Motor used, or get a smaller motor like a more common 2200, or switch to an off brand like a Hobbywing ESC / Motor or a Leopard ESC or Hobbyking ESC and something like a Tacon motor. Easy ways to save some money.