Just short circuit a series of buying and selling lesser cameras and just go right to Hasselblad and you will never look back.
+1 I've always said: buy the most expensive tripod you can possibly afford first, because you're going to buy it eventually and can skip buying all the others in between. Wish I had said (and done it) with MF cameras as well.
For many, it's certainly the aspect ratio. But honestly, I shoot 1:1, 3:2, 7:6, and 5:4. I almost never think about that before I pick up a camera. I adjust my vision to which camera I'm using...and that's mainly the Blad.