NZ Laptops obviously charges a premium on private buying prices but they are a name I have heard of and I think they have been around a while - which is something to look out for when buying second hand systems.
The likely source will be ex-lease machines from a business environment.
If the 12 month warranty is something that is attracting you to a purchase then make sure as best you can that the company is actually in a position to provide that warranty, and see if you can try to find out what previous customer experiences have been when it comes to after sales service (because if it is poor or non-existent then it defeats the purpose of paying a premium for the said warranty).
Thanks for that. "Ex-lease" sort of puts me off a bit, I'm guessing they would have likely been worked pretty hard in a lot of business environments. Doesn't give me a lot of hope for how much longer they would last.