We have so many boxes of Penne at our house it's ridiculous - every time someone goes to the store they keep buying it when we don't need it, so I am totally sick of Penne personally, lol.
I would say one of my overall favorites would be small rigatoni. Gia Russa brand makes them and they are only about an inch long and maybe half an inch wide. I like them because they are filling and substantial, and pair nicely with stuff like chunky vegetables, or a chunky meat sauce, and it's much easier to eat them with a fork than a long pasta. The larger rigatoni I'm not as fond of because they take forever to cook, and usually suck up all the sauce and become dry pretty easily, when you have leftovers.
My next favorite would probably be thin spaghetti. While I usually don't like fumbling around with eating longer pastas, I don't mind the thin spaghetti as much. Angel hair often gets all stuck together, plus it gets cold too fast if you don't eat it right away, and regular spaghetti is a bit too heavy imo, so the thin variety is just right when I am in the mood for something simple like pasta with garlic and olive oil, or a simple pasta dish with clams.
Orzo would be my third most favorite since I use it in wedding soup most of the time (or Pastini), but it's also a nice change of pace from the typical elbow macaroni when making pasta salad too - I especially like making an Orzo pasta salad with lemon juice, olive oil, cucumber, feta, and mint.