I'm gonna do what I did last year and wait until the dust settles and most people get where they belong. I don't want to be matched with some clueless potatoes who got lucky in their placements, nor do I want to be forced to work with them to fight through the pissed off tryhard high-elos who got stuck with trolls and tanked 10 games in a row just to see if I can land back in gold to sit on it until the Victorious skin is released.
Teambuilder would be nice in the meantime, but from what I understand, Blizzard Riot doesn't like to backtrack, especially when they're doing all that they can to keep Dynamic viewed as "the future of League."