I am in desperate need of a new laptop. I have some money coming in from tax, but am putting it towards a house deposit. So I am looking into interest free, no repayments for 18 months. Only looking to spend around $500-700 and would have it paid off before 18 months is up so no problems there. BUT I heard from someone that it's not good to have store credit cards (even if all paid up) if you are thinking of applying for a house loan in the near future.

Is this true? And who has done this interest free stuff?