Great Question! Two big investments in the same 4 years.
I would advise the following:
1. Consult with a tax Consultant
2. Try to buy a home under $416,000 to be conforming
3. Have your lender check for a FHA loan for you.
4. Have full documental income
Remember, interest only normally requires a minimum of 5%down payment. Please consult with your professional lender.