Most people I have talked to think Temur is the weakest clan. But it can also be very open, because Jeskai is the other perceived weak sister and they share Izzet (ah, my Izzet, why you so bad in limited?*). It's interesting that you like Temur because you hate counters and I have been thinking that running countermagic might be the way to roll in Temur.
I certainly don't think Snowhorn Rider is first pickable. I was at a draft where I passed about 7 of them. If I wanted to go Temur I would take one of the instants or arrow storm first.
I think this pack is between the Rare and 3 uncommons (all of which are somewhat flawed).
Dragon Throne of Tarkir really seems like it has potential but I think you have to build around it.
Ride Down is good removal, but only if you are the beat down. And in my (limited) experience you cannot force a beat down deck in KTK draft.
Waterwhirl is a blowout but very expensive, and even
Swarm of Bloodflies is probably the best creature and there are some good synergies with it... but in the end is it that much better than Scaldkin??
Arrow Storm is maybe Waterwhirl lite... but going to the dome is pretty neat.
I might just take the dual land here.
* Exception: RU artifacts in M15.