I'm also married, also own a house and I've been through this. I hope you can get something useful from my comment. Our realities are certain not the same, but anyway...:
I don't know why you need money at this stage, but please, do not depend on angel investing right now. Do something that you can charge users for right now (today!). Charge them. Are those potential customers willing to pay you TODAY for the product to be delivered in X weeks? Do that. Do not play lottery with your life.
Angel investors will invest in pretty much two types of startups: 1) startups with crazy ideas that can make everyone millions or fail miserably (think color.com) 2) startups that have a reasonable idea with good traction where return should be smaller, but certain
That said, my opinion is for you to get users to pay you right now or try to do some consulting and build something people will pay for immediately.
This was a very honest comment, best of luck to you.