Popularity is also a very important factor. If you opt for a less popular aircraft you will get a lot more for your money. In choosing my current aircraft it ended up as a toss-up between a Super Cub and a Maule. I could have bought a 235HP Maule with much greater load-carrying capacity, good cruise speed and 4 seats for less than my 2-seat 150HP Super Cub cost me in the end.
The flip side is that if you do pay more for a popular aircraft type it is also more likely to hold its value. (I tell myself this on a nightly basis.)
QDM