well you've got two options.
1)get settled buy house then buy gtr.
2)buy gtr, then sell gtr to pay for house.
if you don't beleve me, look on car sales and see how many gtrs are for sale because the owner wants to buy a house.
besides when you buy a house you might be able to buy a r35 by then.
have a think about it, you are the only one who can make this decision.