Here's a couple that I know of. I've never had any work done at either shop, but like what I've seen.
Acor 4x4 - Fair Lawn, NJ
http://www.facebook.com/ACOR4X4Some of their work:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=88&t=69472Jeff Daniels Jeep - Harleysville, PA
http://www.jeffdanielsjeeps.com/jd/They are an authorized Jeepin by Al installer.
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2008 Liberty Sport 4x4 Automatic
Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof RackM116A3 Trailer build thread: viewtopic.php?f=72&t=77997