I'm like you Jon, and lived in the old black & white world for too many years, thinking everything was just fine and I didn't need anything better.
I decided to bite the bullet last season & bought myself a nice 7" wide, color GPS for the console and couldn't believe how much it opened up my fishing world. I always figured I knew my way around the waters I frequent, but soon found out how much more there was to them.
Never thought I'd bother to upgrade to a color sonar either but am sure glad now that I made the decision, and will probably also be buying another one to replace the relic that currentely sits on the bow of the boat.
Don't know if they'll catch me anymore fish or not, but at least now I'll have a better understanding of the waters while I'm getting skunked