There is also another formula that is often used to calculate how much you can afford per month (e.g., what mortgage payment you can comfortably carry).
Gross Income X .28/12
$33,000*28%/12 months = $770.00 monthly mortgage payment
Then, your credit score and other factors will determine your loan finance rate. Depending on the finance rate you qualify for and the length of mortgage you wish to carry, this will determine the principal amount of the loan.
Depending on how you run the numbers, there can be a fairly broad range of home prices you could shop for. For example, for a 15 year fixed rate mortgage at an extremely low rate of 3.75%, you could possibly swing nearly a $120K loan. Assuming you've saved 20% down, your house price could be around $150K. You could shop for homes ranging all the way up to $175K, with room for negotations.
For a 30 year fixed rate mortgage, though, you could still keep your payment around $770-$850 house payments but afford a much higher principal. Just know that the total interest you'll pay over the life of the loan will be much steeper. You'll pay around $40,000 in interest for $120,000/15 years and $130,000 interest for $200,000/30 years. Each will have nearly similar monthly payments, but in one case, you'll end up paying almost $100,000 extra in interest over time.
So, you can see that how much house you can afford will largely depend on the loan terms you qualify for and the duration of the mortgage that you want.
With FICO, time heals all wounds.