Samwheat, I'm not that far from the area (I'm from NJ). Commuting from Conshohocken, or for that matter, driving anywhere East on I-76, aka Schuylkill Exp., into Center City Philadelphia, is a nightmare during morning drive. Afternoon drive, Westbound on I-76, is not that great, either. If you plan to commute, give yourself a reasonable window of travel time, depending on where you decide to live at (Bucks, Chester, Delaware, or Montgomery Counties, which are within 30-90 min of Center City-Downtown).
To expand on HemiMetal's suggestion, check with the local LE of where you plan to live at. This is also very important if you have youngsters of school-age. You and your spouse can screen the districts, taxes, etc. Another thing (which can be risky) wherever you have narrowed down where to live at....drive around the neighborhood at night. You get to see how your neighbors really are, as well as how the police respond to calls and such. One thing I can guarantee is that the Various LE departments will advise you
NOT to move into Philly and its Suburbs (Philadelphia County consists of Philadelphia and numerous sections-North Philadelphia, The Great Northeast, South Philly, Southwest and West Philly to name a few).
www.phila.gov
Market St. is mostly a two-way street. You have some outdoor and in-garage parking. Most of the streets are one-way and are also narrow (they never bothered to expand the width from the days of the American Revolution:shakehead

. Check to see if some of the parking companies have monthly plans, as well as daily early bird plans. Once you feel comfortable with the parking, maybe you can decide if you still want to bring your Challenger, but have a alternate vehicle just in case.
As far as the train or bus, check with SEPTA schedules
www.SEPTA.org
Philly Auto Show is in town at the Pennsylvania Conv. Ctr., from Jan.31-Feb 8, 2015.
www.phillyautoshow.com
I hope this information helps you out. Good luck and success on obtaining the job.:smileup: