The two mortgage thing is interesting, I'll have to look at that.If you're truly set on avoiding a PMI payment, there are a few options that will get you there.
The first is to put down enough money to not have one. This is the simplest in terms of the process, but most people of our generation have a problem getting anywhere near enough money to put down that large of a down payment. And as Todd has mentioned, it may not be the smart play over time anyway.
The second is what my wife and I did while buying our house 2 years ago. Our "PMI" is built in to our interest rate at something like an eighth of a percent. This is called Lender Paid PMI. The downside to this is that we will pay it for the life of the loan. The advantage is that because it is not differentiated from standard mortgage interest, it becomes a tax right off at the end of the year. Standard PMI can not be written off on your taxes once you hit a certain income. Our long term plan when we bought was to stay in this house for 5-10 years and then move up. At that time frame, we save money over a standard PMI. It should also be noted however, that both my wife and I both hover around an 800 credit score. We also bought in July 2013 and our combined rate is 3.75%.
The third option was what we had originally planned to go for, before deciding on the Lender Paid PMI. You take out 2 mortgages. I don't remember the exact numbers, but for sake of explaining, I'll estimate them from memory. The first mortgage is your primary and works just like any other 30 year mortgage. It is for 80% of the loan value. The second mortgage is for 10 or 15% of the loan value. The second one will be at a higher interest rate and will be for a shorter term than the primary loan. You put down the other 5 or 10%.
Both the Lender Paid PMI and 2 mortgage options saved us money over paying a conventional PMI. That may not be true if you plan to hold on to your property for longer than 10 years though. Ask who ever is doing your mortgage to put together numbers for all of the options and see what works best for your situation.
I found a really great property that's HUD owned, which I hear can be a pain in the arse to buy. Anyone have experience with these?