Sabrina ... it does depend on how much you mortgage (20% down? 10%? 5% 3.5%??), the interest rate, home owner's insurance and taxes.
That said, a $175K house in South Boston, would be about $1861 in taxes (totally depends on what it's currently assessed at, but if it sells for $175K ... it'll get to $1861 annually in the next year or so) ... Homeowner's insurance, depending on what kind of policy you get might run you about $1000 a year and perhaps you get an FHA loan so you get a decent rate ...
Just to take a stab at it, for a $168, 875 loan (that's putting 3.5% down for an FHA) ... I'd say you are looking in the ballpark of $1500/month ... of course, if you put more money down, get a better rate, pay less taxes or any of those things, you can reduce your payments.
If you're dealing with a bank owned, you'll also need to make sure you factor in the upfront money for fire inspection, home inspection (no contingency) and closing. If you are a first time home buyer, you may qualify for the $8000 tax incentive ... I'd be happy to help you with this if you're interested in having professional help in this transaction. Bank owned properties tend to factor agent commissions into the process since they rarely want to deal with these transactions themselves and the buyer's agent tends to do most of the work.
Hope that helps.