For the CRT.5, this is what I would choose for a limited budget:
Mamba Max (MM) ESC Feigao 9L or Feigao 8L Maxamps 3s 5000mah 20C Lipo Castle Creations BEC
I realize that's pretty much what BrianG said, but it is a good setup.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz