Also to add to what Kyle has said the rear tyres are not staggered (eg: Fr 225/40/18", Rr 245/40/18") so you would need to replace the tyres straight away adding more to the cost of these, ...plus the front tyres are a crap brand so again I would consider replacing these again. Unless you don't want to run a staggered set up as Nissan intended of course.
You might not be far off a lower end new wheel & tyre package by which point.