Equipment Upgrade

Hello Raymarine: I want to upgrade my equipment with new...what do you suggest?!
My boat is a 1996 Carver Santego 31 foot twin diesel.

1. Autohelm radar
(1) Datamarine Chart Link/GPS
(1) Autohelm ST7000 autopilot
(1) Autohelm Tridata
(1) Garmin 2010C chartplotter


I would like to include a GPS Chartplotter Fishfinder Radar bundled on a 9 or 12 inch display. Can I use any of the existing equipment or do we have to reinstall with new?

THanks...