My theory is this.
If you like it, then it doesn't matter what its 'worth'.
How much will cost to replace with something you like equally as much?
And would it too might have items that need money in the next couple years. ??
That's the real question in my opinion.
Body looks great. So its not like dumping money in a rust bucket. Timing belt is a regular item on those, so its not like somehting that unusual or difficult.
The only danger in this reasoning is if the car is in an accident and the insurance company has a low book value on it you might not get as well covered as new car.
But yours car is in nice shape. You could either save some money (self insurance) for a 'just in case' fund, or try for an agreed value policy.
