Your 730 GMAT is strong. For top programs, it is helpful to have at least an 80th percentile on the quantitative section, so the admissions committee feels confident that you can handle the quantitative rigors of the program. You could also supplement your score by taking and acing a quantitative class such as statistics. In terms of work experience, 3 years is on the lower end of the range. If you can showcase leadership and maturity in your roles, you can offset that. When you are applying to business schools, you will need to articulate where you want to go in your career and why you need an MBA to get there. It sounds like you are planning a career change before business school. So here are a few questions for you to consider to make your decision of when to apply. Will my upcoming career change relate to where I want to go after business school? Will I be able to articulate why this change now and why business school right after the change? Will I have enough time in my new position to have strong examples to demonstrate my skills and experiences in my application? Make sure that you feel that you will have a compelling story about where you want to go in your career, what relevant skills and experiences you have to date, and why you need an MBA to get where you want to go.
Insiders Guides: http://www.mbamission.com/guides.php?category=insiders
Free Consultation: http://www.mbamission.com/consult.php