1 Cor 10:23-24: "Everything is permissible - but not everything is beneficial. Everything is permissible - but not everything is constructive. Nobody should seek his own good, but the good of others" (NIV).
Be careful of your example. While it may be OK with God for you to have an expensive car or expansive wardrobe, what do your kids, who are less mature, see? They may see someone indulging themselves with the world's idea of treasure. Consider the lesson you are indirectly teaching your children and then make the decision to buy or not. Are you building up or tearing down? They are learning a value system from you directly and indirectly.
Everything you acquire is an example to your children of your value system. Where your treasure is, there your heart will be.