The reason why you should not even consider to buy a shiny new laptop with your budet is like kangal said.
You could afford a recent "low/mid spec" device with i5 and 8gb memory for your money but will pay 50 to 60% more than taking a 4 year old high end device of that time, having same performance as said new modells and money left to equipe goodies.
Why you should go for a lenovo if buying used is availabillity and price of spare parts imho. Changing/upgrading even display is easy and detailed maintanance manuals are available for DL.
So, no custumor service needed imho.

Oh, yes. i forgot to mention lenovos killer feature if you have kids