I love the Blue Hull, there are a couple 34's on this site painted blue. *
Anyway there are a couple of recent threads on this site, where we pretty much beat the topic of electronic upgrades to death. *I think they are mostly located in the topic line under Maintenance, and look in*Electrical and Electronics & Navigation
I personally upgrade to a Garmin 4012 chart plotter, with GPS, Sonar and network. *The new stuff Garmin produces all networks together if you wish, by simply plugging them together with a USB cable through a network adapter. *If you have any electrical / assembly skills at all, buy your components on line and install them yourself and save a bundle.