I agree with jonwill 100%. If there's anytime that you have to "budget", this is the time. If you have have the grades and are lucky enough to be able to choose, salary should be secondary and program quality should be numero uno.
The quality of your program can possibly be a strong determining factor in the starting salary you are offered after your training. So a sacrifice now (in salary, not quality of training) may have major dividends in the long run...
I agree also. Money always matters, but pick a program based on high quality training and a good fit for your style/personality/interests first and foremost. Salary can be a tiebreak between good programs or icing on the cake, but also be concious that salary isn't the whole picture... do residents get free food? Gas milage allowance? what's the CME allowance? What's the med/dental insurance premium/coverage? etc? All that info is usually available from the hospital's website or Grad Med Ed dept if it's a major teaching hospital with residencies in various specialties (so that you can avoid looking a gift horse in the mouth if you're a good student who would be competitive at a lot of high quality programs).
In the end, what you make in residency is peanuts compared to what you'll make as an attending, so training (total picture.... scientific, surgery, pt relations, and prac mgmt) is much more important IMO. I was pretty fortunate in that my top choice program was also one of the highest paying in the area - and country when you factor in cost of living. However, I would have just as easily been willing to settle for low income with high cost of living if I had decided another program was my best fit and had interviewed/matched there.
Honestly, unless you have kids and/or are the only household bread winner, you probably won't even have much time to spend much of the money you make in residency. As long as you live within your means and you weren't spoiled or working a "real" (college educated, $40k+) job before pod school, the resident salary is definitely not bad compared to the student apartment, mac and cheese, and can beer that most of us were probably accustomed to in undergrad and pod school.
![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I can be quite honest when I say I'm now able to pay my rent+bills with roughly half my monthly salary and just paying down higher interest debt and saving up for practice startup or buy in/out right now with the other half of my salary.
If you are planning to go to work as an associate for a group or FTE of a hospital, etc after residency, then you definitely want to make sure your training and numbers (as well as possibly the program's brand name, if you want to work for other pods) is good. Fellowship is also an option since it'd make your app quickly rise to the top of the stack for good jobs, esp at academic hospitals. Just like getting a residency, it's usually as much about networking/personality as it is about paper application, though... "it's not what you know, it's who you know."