50k income, looking at homes

Hello all,

We have about 20k saved up for a house, we qualified for a home in the 220-225k range with a 50k income. We are estimating payments at 1700 a month on a 4,100 a month income for some homes we have seen. Wondering about the wisdom in this? My income is around 50k, after our down-payment we would have 10k left in savings for emergencies and about 20k in our Roth IRA. I am 32 and married with two kids. My income is not going to change next year for the worse, but will most likely only go up.

What is a good number to consider for our house payment? Should we be saving more first for a down payment?