Much against my personal choice, for the aircraft you are probably slightly better off going Cessna, though Pa 28 is also not a bad choice. I would love to be putting forwards an aircraft that handles decently but most of these will end up costing.
For location you are probably over simplifiying it, there are so many factors to take into account. Given other factors being equal then you are obviously better off with a hard surface as a grass runway will mean you lose days when it is too soft, but then you need to take into account how much you pay in lease costs/hangarage/landing fees etc. where your engineering will be done, how much competition is in the area and where your customers will come from, when you have taken all this into account you may find a hard runway is a bigger or smaller part of the descision.