Sounds like you have to make a hard call between two attractive job choices. I had a similar situation a little while back. I found the below method useful. Let me quote the man then on to an example.
"“My way is to divide half a sheet of paper by a line into two columns; writing over the one Pro and over the other Con. Then during three or four days’ consideration, I put down under the different heads short hints of the different motives, that at different time occur to me, for or against the measure. When I have thus got them altogether in one view, I endeavor to estimate their respective weights; and where I find two, one on each side, that seem equal, I strike them both out. If I judge some two reasons con equal to some three reasons pro, I strike out five; and thus proceeding, I find where the balance lies; and if after a day or two of further consideration, nothing new that is of importance occurs on either side, I come to a determination accordingly.” –Benjamin Franklin"
In a nut shell, write up a chart (excuse the csv):
Element, Importance Factor, Job A, Job A subtotal, Job B, Job B subtotal
Commute, 5, 6, 30, 4, 20
Salary, 8, 7, 56, 8, 64
Then add up your sub-totals for A (86) and B (84). Larger number means that choice has a more of what you value. In this example Job A wins. Buy yourself some time to make the decision. Be honest - tell them you've got to run the numbers.
The below link expands it better than I could. Scroll about mid page to see a nicely formatted chart.