Pardon me, but I've only been to PA a couple of times. I'm curious: why is Harrisburg preferable to Allentown? Or is it a career move? It's for personal reasons. My wife and I are originally from Mechanicsburg, a town just outside of Harrisburg. We moved to Allentown in late 1996 when we got married, because of a big job offer I had. But I left that company in 2003, and have been doing independent work ever since. My wife and I miss our family and friends back in Mechanicsburg, and she got a job opportunity back in Harrisburg. So we're moving back. It won't affect the work I'm doing at all, and we realized we'd be much happier back home.
Personally, I don't like Allentown that much, and prefer Central PA. Only advantage to Allentown is that it's closer to Philly!