You should have enough for a downpayment on a 600k house with that one year of saving. You dont need 20% down. Mortgage insurance is really really low if you have good credit and you can get away with only say 5% down.

Now, having a bigger down payment helps keep monthly payments low, but keep in mind you are tying up that cash as equity in the house, and you could likely outperform your mortgage interest rate with investments.

You should talk with a mortgage broker or banker about your options and what your budget is with what you've saved so far. We only had to come up with 24k in cash to close on our house for example.