dragon...unfortunately, I do not, I was merely interested because I know of a place you should stay away from in Exton (as I didn't want you first experience in software development to be a bad one).
I agree that you should push for some time to make your decision (as it seems like you may have a few options on the table.) However, aside from asking for a bit more time (which the company should afford you), I would not walk away from an offer. As many others here have stated, work there for a little while and gain some experience and then find a new position when you have time and while you are actually earning a paycheck.
Just to give you some insight, I took a job for less than what you are talking about back in 2k3 with a major software company (working as a QA Analyst). I worked there for 3 years, the first 2 years I got meager 3% raises and in my final year was able to work out a 10% raise. That year our office closed and as part of my layoff package my manager worked out another 15% raise to 'take with me' to show other employers what I was currently worth. I am on my third company since 2006, unfortunately the first one was heading toward layoffs so even though I liked the job I left before the inevitable happened, the second one (in Exton) even though it payed well had no idea how to develop software (and even worse really didn't want to learn), I am now settled in nicely at the third (have been there for 6 months and have no desire to even consider leaving). I have substantially increased my salary every time I have moved, I have gained experience with many different coding and scripting languages, with different software development methodologies, and I have learned a lot about how to play the corporate game and negotiate in large corporations and in tiny startups. My point is that your starting point really has no bearing on where you end up, it is merely that...a starting point. Be careful of how often and how quickly you jump from job to job, but at the same time, do not be afraid to accept a position, gain experience and then force their hand when it comes time to talk about a salary increase. As a wise friend in my first corporate gig once told me .... when it comes to management there is what they SAY they can do and then there is what they CAN do. Management can always do more than they say they can, there is always more time, more money, and generally even more benefits they can give you. If this place says they can't do any more, you may still want to take the job, but guaranteed if you prove valuable to them and come to them in 6 months with an offer from another company, they will match or beat it.
Good luck with your decision and remember it is just that, your decision. There is no right or wrong here, it is simply a life experience and regardless of what you decide each path will be exciting and different and good if you keep a positive attitude and good friends, good family, and good beer in your life. Cheers and keep us posted on how it goes!!