Keep in mind that 28% is what is usually allowed for you mortgage. 36% is allowable as your total debt-income ratio. There are a lot of factors to consider before making this decision. Do you have a car payment? Do you plan on having a car payment? Do you have revolving debt? Student/Parent Loans..etc? If you don't, 33% is not unreasonable. But of course, the biggest factor is your comfort level.
Don't completely rule out renting for a year, if necessary. A lot of people will tell you it's better to own a home you don't want than to rent, but that's usually not the case. Depending of rent prices in your area, your short term goal may be to spent the least amount of money possible. Mortgage loans are so front loaded with interest, you hardly pay any principle the first few years. Now assume your appreciation is $10k for one year (I think that's generous based on my area). Sounds great, but after paying realtors, and transfer stamps (based on your area), you may be upside down. So if you own a house for less than a year, you may actually have to pay to sell it.
I'm sure you'll make the right decision. I've had a few interesting experiences buying and selling, I just wanted to add my perspective. Good Luck.