I'm really trying to understand here. Here's how I compare the options. The money "thrown away" on the mortgage (interest + tax/insurance) starts out at about $1100 and goes down with every payment compared to the $2000+ that is gone for rent and would likely increase each year. For tax benefits, with my wife's salary we will have a combined income just below $150K so I would hope we can get some tax deduction. As far as I know we don't get any tax breaks for renting. Additionally, I can put more money on my loans which average to a weighted 7% interest (Stafford and Grad plus) if we are paying less monthly for housing.
We've rented 4 apartments over the past 10 years and 3/4 of the landlords were really slow with fixing things and would often times hire someone who does shoddy work. We are actually looking at fixing things ourselves as a benefit because we can do it right the first time and not end up calling about a problem multiple times.
Now we're getting somewhere. Given your income (3 times a resident's incidentally) you may do better buying.
$24K is comparable rent
$785 in interest* 12 = $9420
$476 in principal* 12 = $5712
Insurance (let's say $100 a month) = $1200
Maintenance (let's say 1% a year) = $3000
Loss of earnings (opportunity cost) from $10K downpayment and 5% buying closing costs = $25K * say 8%= $2000
Buying and selling costs divided over 3 years, 5% to buy, 10% to sell. = $45K/3 = $15K.
Total = $36K per year. Subtract out the $5712 in principal since you don't lose that and you're at around $30K a year vs $24K "thrown away." I didn't count the tax deductions but I also didn't count the property taxes, so let's assume they cancel each other out. Basically, you need the house to appreciate 2% a year to break even. Not a horrible gamble, if you really want to own a house.
Why "hope for" a tax deduction? You can't calculate it up front?
It's also not clear to me where this extra money is coming from that you're planning on paying down loans with? Are you not planning on insuring, maintaining, or paying the taxes on this house? Did you mention you wanted to fix it up too? I estimate your cash flow will be a lot worse buying than renting, even if you come out ahead in the end. If you really want to pay down the loans (you don't seem to) rent a cheap apartment, use that $25K you're going to sink into this house to pay off loans, and then use the difference between renting the house and renting an apartment to pay down loans. Don't just pretend a mortgage payment can somehow be compared to a rent payment just because the realtor's billboard seemed to do that.
Too many first time homebuyers (and for those of us who are really dense it takes us 2 or 3 times) underestimate maintenance costs and transaction costs.
All that said, you can afford this given your spouse's salary, so don't let too many critics make you feel bad about buying. Just realize that it probably isn't the screaming deal you thought it was at first.