Seems a good price for an Airportable, but they are money pits. If the bulkhead is crusty, ecpect to spend lots on fixing it, as 'normal' Landy ones don't fit. All the specific body panels for the lightweight are hard to find, running gear is cheap as chips. Bear in mind the 24v electrics on that one too.
The 'lightweight' is fun as hell to drive off road, or in the summer with the ragtop and doors off, but it's slow, noisy and thirsty. Driving it is like taking a labrador puppy for a walk, it's all over the road thanks to it's short wheelbase and cart springs. No power steering in any of them either. If you're set on a lightweight, look around, definately don't buy the first you see. If it's been standing take extra care inspecting the bulkhead, chassis and check the fuel tanks for leaks, they are pricey and model specific. most of the running gear epert from driveshafts and some suspension and breal parts are 'normal' series, so easy to get and cheap to boot. Dutch army 'lightweights' are deisel, so a bit cheaper to run although not by much! It's a bit like owning a splitscreen VW, more of a love affair kind of thing rather than a genuinely useful type of vehicle. They are a peice of wee to look after other than welding though, clutch change on my own took 3 hours, without dropping the engine.
Just replaced my S3 lightweight with a 90 2.5td. Still thirsty, noisy and slow but a bit more useable and still only cost me a grand.
If it's your first Landy I'd say look at a 'normal' S2a or S3, there will be hundreds at that sort of price. Avoid ex military, simply because you'll pay a premium over civvy stuff. I was lucky with my 90, the owner didn't know it was mil, even with the pioneer tool fittings on the back door and the military ID plate!