fair enough,
well a few things to look for then.
dont bother with the A model, there's no point, you can get a good C model for around the $4500 mark if you look around.
check the steering stops, they're fairly week on the zxr250s and generally the first thing to break in a crash. also if they are broken, then the bike shouldn't be on the road as it's had a fairly nasty stack resulting in damage to the frame.
Kms won't be too much of an issues as i've seen em still running well after 200,000km

and the clock will have been wound back when it was imported and complianced.
Don't let any fool tell you it's not a grey import, to the best of my knowledge and everyone here, every single zxr250 has been imported privately.
get one with a good amount of rubber left, you don't wanna have to replace tyres straight up, it's just an extra cost you can avoid.
make sure you get the key for the rear compartment too, it's a bitch trying to get one cut. kawasaki have to send one out from japan to be cut.
make sure there isn't too much slack in the clutch and brake cables and that they move fluently. the suspension is pretty soft on these, they were built for a 60kg jap bloke. but they are fully adjustable which is why i went for one of these in the first place.
make sure that when you go to look at one (this relates more to private sale) that the engine is cold when you go to start it up. it should take a fair amount of choke to get it warmed up. if the revs go straight up when you start it with the choke on, then it's been started recently. ask the bloke for a cup of coffe while you wait for it to cool down

if there are any issues with the engine, it'll show up when it's cold. i.e. you might find a severe flat spot around 6,000 RPM when it's cold, but it might disappear when it's hot.
also, check out these threads for more info,
http://www.ksrc-au.com/phpBB2/viewtopic.php?t=9052
http://www.ksrc-au.com/phpBB2/viewtopic.php?t=10470
but basically go through the forum looking for any heading of ZX2 or ZXR250, you'll find heaps of info.
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There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die.