I recommend a HammerHead 75cm it will cost you $249. Awesome gun, accurate and quiet.
We offer a unique set of product for the serious spearo
I have several JBL's including a woody- The Problem they have is they punch a big hole. Great for Carp- But I don't recommend for smaller fish.
Also depends one what vis you are spearing in. If it's really clear might want to get a 90 or 100cm.