What kind of rallying would you be doing? If its the SCCA pro rally league, then i suggest you stay away from that until you can purchase your own car. Auto-x's are also fun, but way less dangerous and demanding on car specs and yourself. Rallying you have to worry about damage and its more serious, auto-xing is also serious but wont be nearly as tough as the pro rally for beginners.
"Jam Harder, Penetrate Deeper, Dispense Longer"
"In God we Trust, All Others we Monitor, Jam or Deceive"