yep....use your current house to get a loan....but keep an eye on prices...go for those that are in areas where prices are on the up. 6 years time - you will be laughing. Your parents would be laughing. And you will get that elusive gtr. I used 6 years, because for the first 6 years you are exempted from capital gains if you are a first home owner.
Thats what I am doing now - 2 months ago I was going to sell the r33, and get a brand new mx-5 limited edition for 50k. Then paused for a second and thought about it. If I bought the mx-5 for around 50k - id have to sell my r33 (15k), then sell my shares (12k), then get my loan (30k - to accomodate for orc, insurance and what not). Then Id be living in my parents house for the next 2 years (maybe more) - and i sooooo wanna move out within the next year or 2.
Instead, I have money now in shares, going to get a couple of properties in a couple of months time to give out for rent, and modding the r33 on a budget. Later this year, or mid next year, when my shares have reached their peak - I will sell them, and reinvest in other stocks and get another property. Oh and If i have excess money lying around, the plan is to get a gtr or a lotus exige
edit: if you want more info - pm me. I can get my boss to help you make more money.