Maybe I am old-fashioned, but we are trying to save 20% for a down payment, and we are doing it by a). continuing to stay in our rental apartment for as long as it takes and b). trying to live beneath our means.
Some things that help are that we are debt-free, we have about 20% of the total in existing savings, we both work, and our rent is way below-market because I've been a tenant in the same place for over 10 years.
We created this goal back in January, and we are now about 50% of the way there. One thing I like about waiting is that it is giving us more time to see exactly how much we can put aside each month for a mortgage and taxes and still handle our usual expenses and emergencies comfortably.
We couldn't have saved this aggressively a few years ago, when I was a grad student and working part-time, and DH was starting his own business. But now we can, and I'd rather wait and save and risk the interest rates going up a little bit, rather than doing it now and taking out two loans to cover PMI.