I am a Caitlin, and I really can't recommend the name. Between all the ridiculous spellings and the problem of sounding like a perpetual 5-yr-old, it's just not good.
If you do decide to use Caitlin, spell it however you want because there is a 0% chance of anyone ever spelling it your way, no matter what.
Some C names I prefer:
Caroline
Catalina
Coral
Clara