Congratulations on your "new" Hatt. You probably have four major investments: Engines,genny,electronics,hull. I'd focus on them in that order.
Are you repairing the bow thruster and stabilizers or planning on installing them new? If the latter, you should be SURE that before you spend such large sums you are certain of you future boat use.
Better yet, wait a year before you add anything major unless prior experience has already convinced you it's a "necessity". A mega yacht captain told me " the bigger they are the easier they are to handle"...All ideas are just great before inception, but many turn out to be "irrational exuberance". For example, if you pull in and out of slips daily or weekly in troublesome currents a bow thruster may be a great aid. But it's totally unnecessary for cruising and anchoring. As for stabilizers, frequent use in open ocean might make them very worthwhile. Cruising in local inland waters makes them a fuel drag which adds nothing to your boating experience. For an annual crossing to the Bahamas they'll likely cost you over a thousand dollars a trip.
I'd first be a lot more concerned with insuring my main engines and genny were safe and sound. Make sure the mains turn up rated RPM at WOT. Run them that way for ten or fifteen minutes and carefully watch coolant temperatures. Ideally have somone in the engine room to monitor. Do a careful inspection while under load for leaks and use of an infra red thermometer to check each exhaust port temperature, inspection of fuel filter bowls for crud, changing filters as required, etc. Nothing will give you greater peace of mind than the following: salt water flow alarms and transmission oil cooler temperature gauges for your main engines, a genny coolant temp gauge and alarm in your salon, and spare impellers for mains and genny. Maybe an impeller puller...total cost under $1,500 if you DIY. Dirt cheap insurance. When were your raw water impellers last changed? At 500 hours I'd sure do it.
Also, how many hours since your engines were tuned?? If it's over a thousand hours or so, that's likely a worthwhile expenditure if you'll be running much. Under $50/cylinder. Maybe have the the genny valve clearances checked also. Maybe $200 or so.
The other thing you must do is use your boat...if you are experienced at handling so much the better; if not, use the boat and find out how to maneuver her. You'll never get the practical experience you need sitting dockside. Exercise everything on the boat...you'll find many things that don't work or work differently than you expect. Use your electronics: practice with GPS, radar, atuto pilot,etc. Don't wait til nasty weather/fog etc to find out how to use your electronics.
The above should take care of 95% of common problems on a new boat.
