Aren't Latios and Latias considered Dragon types? I'm quite fond of Latias. Out of the choices on the poll, I'm thinking Flygon is the winner.
Salamence: Looks really awesome, and it looks like an actual dragon, which is nice. The only problem with that is that I think its legs are a bit stubby.
Garchomp: Overrated and I'm not that into its design. Then again, I dislike most of 4th Gen.
Dragonite: We have a love-hate relationship. It's cute, but...
Altaria: Adorable. I love Altaria. End.
Flygon: I think Flygon has a really unique design. I mean, it's an insect, but it's a freaking dragon as well.
Kingdra: Again, great design and I love it. It's strong and its only real weakness is Dragon, but it can also pack an Ice Beam. One of my favorite Water types, which is saying something because I don't like most Water Pokemon. I also really like Seadra.