Cut all your discretional expenses:
Travel, collections, etc.
Roth IRA is not going to help you as you contribute after-tax money.
Save enough money for your down payment by: sell your collections on Ebay, kids don't have to go private school, you don't need to go back to China every year, and you don't need that nice brand new car.
You can buy your dream home now as this is a buyers' market, convert your existing home to a rental property.
I don't make nearly enough money as your guys do but I have my MBZ/Lexus and rental properties lined up.
Lesson: how to manage your personal finance.
