Taxes are predicated on a combination of: house value, cost of county services (county tax), cost of school services (school tax), cost of township taxes (township tax) and if charged separately, sewer and trash taxes.
As a result, two homes that are of similar function, size, quality, and value can be located in two adjacent townships - even across the street from each other - and have widely varying tax bills, if the townships involved are different.
If the school districts are different and the county is different, that adds the potential for even more variability.
I lived in Havertown for 20+ years. I felt that the cost of taxes for the relative value of what I had was pretty high. I also looked into reducing my taxes. If you've missed this years' deadline to apply, then your next opportunity to apply willl be in spring of 2013 - and that will not affect the taxes due in 2013, they become effective for the following tax year - in your case, 2014. That's assuming you are successful. And they typically won't tell you if you are or are not successful at the hearing; that comes via a letter in the fall. So at this point, you've got an entire year to wait to even know if you'd be successful in having your taxes reduced. You increase your chances of success if you have an appraisal from a licensed real estate appraiser (figure a cost of about $300-$350 out of your pocket for that) - if you do that, make sure it's relatively close to the time you file your application - don't do it now.
Personally, I found that for the relative value of homes, that homes in West Goshen (Chester County) tend to have a lower tax on a square foot basis and decided to just get out of Delaware County. I went from a roughly 1,200 square foot home sitting on a 7,500 square foot lot with total taxes of about $4,400 a year in Delco to a home that has 3,000 square foot sitting on a 17,700 square foot lot. The taxes were only about $450 more a year, for a home twice as large sitting on a lot that was 2.5 times what I had. I could have gotten a house similar to my old house and paid about half the taxes, but I wanted more space than I had before.