Are you talking about renting or buying? If you mean buying, are you certain about the price? Sometimes sellers accept lower offers.
If this is definite, I would look at your current income and projection. To me, $300 a month isn't a big deal, but if you have job insecurity (and so many people do these days because of an unstable ecomony), it may make a significant
difference. Are you expecting some sort of raise in the next year or two? If so, stretching yourself for a little to have your dream house might just mean temporary tough times and belt-tightening, but no serious bank account damage. Only you know your likely
scenario, and you have to be the one comfortable with your situation. Good luck!