question about investing IRA or saving towards Downpayment for house

[Fast Food Knight]

Currently 22 and am looking to buy a house. Is it better to go ahead and take 4k out of my savings and invest this year in an IRA or keep that 4k in the "downpayment for house" fund and invest in the IRA next year? Assuming i would be paying about 10k in rent for the yr if I opt to invest in an IRA instead of putting towards a house.

thoughts or other options?

EDIT: Forgot to add that I definitely want to put 10% down on the home.