[Los Feliz Slim]

Plenty of banks, etc, have mortgage calculators that will tell you what you can afford. In brief, the smaller your down payment the larger the loan, hence a larger monthly payment of interest (which is, for the time being, tax deductible). I don't know about the market where you are, but I can't imagine you'd be able to afford much, especially if you don't have $100,000 lying around to reduce the loan amount.

Also, as previous posters have alluded to, you've got property taxes, insurance, and maintenance to think about also. A mortgage broker will factor those costs in, but remember they WANT you to try to buy a house and will play it faster and looser.