180,000 kms is ~112,000 miles. That's pretty low mileage given the age. For reference, my brother's 2004 Outback H6 is passing 141,000 miles (227,000 km's) and my 2008 Acura TL is passing 90,000 miles (145,000 km's); both are daily driven.
Provided you keep up with maintenance on your car, you should be able to go double the number of miles you have. I see no reason you'd need to upgrade if the car has nothing major wrong with it (engine, transmission, etc.). Keep in mind, upgrading to a new car will almost surely cost a lot more than repairs on a car you already own. Yes, the timing belt will be expensive, as will the exhaust and brakes (to a slightly lesser extent), but those are all repairs that only need to be done at very sparse intervals. Timing belt changes only need to be done every 90,000-110,000 miles, and I'd imagine the only reason the exhaust needs to be changed in the first place is rust.
Final point, people with super-bright headlights are a problem no matter what car you're driving. Trust me, it's no better facing a bro-truck with obnoxious HID's in the OB than it is in the TL haha.