How did I choose which PA schools to apply to?

There were several things to consider..... price, location, time frame involved, prerequisites, etc.  I first narrowed down my search to my state.  Then I checked prerequisites required... some are the same for almost all PA schools:  anatomy and physiology, general chemistry, microbiology, algebra, cultural anthropology or sociology.  Some schools also require additional classes such as physics, statistics, genetics  or others.  I started taking the "common" prerequisites while I searched for schools, and saved the additional ones for the end, so that I could start applying earlier than otherwise.  Incidentally, I had already taken physics my freshman year of college, so I could throw that class in my "done" category, just as I could the algebra.  Then I looked at the list of schools requiring just the common prerequisites (plus physics), and narrowed it down to just those. 
Next, I compared length of programs to their cost per year to figure out overall cost.  Some schools cost more overall, but had shorter programs, which would essentially let me get out and work sooner.
Then, I looked at individual advantages to some programs... Stanford would allow me to live at home much of the program, which was an advantage, but there would be a significant amount of driving and cost involved.  It also had a shorter program, which is why I applied to it my first year trying.  I ended up applying just to Stanford that year.
The next year, I applied to 2 schools.  Oddly enough, Stanford was no longer my top choice, as their program had extended, taking away one of the advantages.  I was accepted by my top choice school, RCC, during that second year.  It is closer to home (well, 3.5 hours from home), MUCH less expensive, and has an overall feel that I like.
Oh, yes, the "feel"... one thing I left out.  Walk on the campus if you can, go to information sessions about the program.  You will begin to get a "feel" for the program.  In my interview with Stanford, they felt a little, well, snooty.  I could deal with it, but really felt a little like a fish out of water.  RCC did not require an interview, but attending the information session was priceless.  It felt very comfortable, like I could fit in there.  People were smart but friendly.  Even driving around town, I could "see myself" there.  I hoped I would be accepted, and was.  I think God was leading me there, giving me an excitement and a sincere like of the community itself.
So, those were the main things involved in my choosing a program.  Other people may have other things they need to consider.  My GPA was rather high, so I did not need to worry about the minimum requirements.  I did not take the GRE, so only considered schools that did not require it.  Could you apply to many schools?  Yes, but you may spend a lot of time taking extra prerequisites, plus filling out long applications and paying application fees.  It's best to narrow it down somewhat.