2002 Freelander SE. 102,000 miles.

I need to replace the timing belts ($1500) and have a coolant leak that seems to just be leaking on the ground and not into the engine - new thermostat? Also have a misfire on 4. New plugs where put in about a year ago, but I guess its now a wire issue.

I'm guessing all this would cost around $3000 (?). Does anyone think its worth it? Whats the longevitiy of a Freelander? I dont know if I want to put more money into it.