That's all good quality stuff. I used an A4000+ autopilot for way over a decade and then replaced it with a new Raymarine X-5. My old system went onto a friends 38' boat and it's still working fine.
What model series are the other instruments? I installed a set of Raymarine St-60's in 2002 and they still work like new.
No matter what kind of instruments you have, "plus One" on the advice in reply #2.
ps: which C&C 30? The 70's version is considered one of the very best of the "modern classics".