I have a different Honeywell autopilot but the costs are very roughly - £10k for the autopilot unit, £1500 for each servo.
You can get exchange deals which are perhaps 1/3 of the above, but you have no choice about whose old junk you get back under the scheme - a 2 year old spotless unit is likely to be replaced with a 15 year old one. The average age of avionics supplied under the exchange scheme is IME ~ 10 years.
The G1000 I don't know anything about but it won't be cheap.
However, on a new plane you should have a warranty, and you can extend this warranty.
After running with one 2-year warranty extension, whose US$4000 cost I did fortunately recover through the failure of one instrument alone, I have made a decision to not buy this anymore since individual instrument failures can be dealt with by going to a repair station such as IAE. It's a bit like private medical insurance - you will (on average) lose money on extended warranties, especially with a hangared plane.