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I followed the instructions at: http://www.letseehere.com/postgis-geocoder-using-tiger-2010-data

To get postgres working with postgis, but some of the addresses are off 500 ft to as much as 1 mile in my random sampling. Do you know of any more reliable data sets?

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Tiger/Line is only as good as the data submitted to it; there are commercial vendors (TomTom/TeleAtlas or Nokia/Navteq) that are much more accurate but also will cost you several thousands of dollars. For free geocoding/routing of data your good choices are highly limited. –  D.E.Wright Mar 9 '12 at 19:09
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@D.E.Wright Seems a better answer than comment. :) –  Nathanus Mar 9 '12 at 19:49
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up vote 3 down vote accepted

Tiger/Line is only as good as the data submitted to it; there are commercial vendors (TomTom/TeleAtlas or Nokia/Navteq) that are much more accurate but also will cost you several thousands of dollars. For free geocoding/routing of data your good choices are highly limited.

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If you are looking for other geocoding data sources, you would probably benefit by searching and reading previous discussions on this site (with the tag [geocoding]), but a couple specifics I would recommed reading are:

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