Don't know where you are but here in the UK there is the London Boat Show
in January, but I myself always go to the International Boatshow in Southampton
. PSP Southampton Boat Show - Enjoy everything about boating in one giant show!
There are many others around the world, check out this site for details IFBSO
Word of advice, make a list of what you actually, really need on board, these places can be a haven of temptation, like being a child in a sweet shop!
Most of all have fun and play with as many gadgets and go on as many boats as you can!