I suppose it depends on what price you get it for.
I had a '98 model that missed out on the turbo, later models also had a revised gearbox.
The WL(T) motor had a bit of a reputation for doing cylinder heads. Around 1k will get you a replacement head kit on eBay. It wasn't a rocket ship either, but had enough power as the vehicle wasn't that heavy. Keep the correct coolant up to it and maybe a preventative replacement of the water pump and thermostat. Economy wise, around the 10L/100km would be what I'd expect.
They have a timing belt, so make sure that has been replaced. If it hasn't, it isn't a difficult job and a good chance to do the water pump.
If it got the EGR, then the EGR coolers have a habit of corroding and leaking. If you are lucky the coolant goes out the exhaust, unlucky and it goes and hydraulics the engine.
Gearboxes also had a few issues with bearings lunching themselves. If it has been rebuilt, then that's a good thing.
The up side is that they were a reasonably simple motor to work on, the engine bay isn't packed with stuff you can't identify and parts are reasonably cheap.
