Xeno, which if you understand their design mechanics, ought to have the largest sweet spot. It sounds weird though, like something is breaking inside when it connects with the ball.
or used Demarini CF3 or CF4 from someone you know who has moved up in size, or from ebay.
Don't buy a new Demarini or Easton, since you're paying a premium for a bat that isn't even broken in yet. Avoid the pastel Eastons from 2-3 years ago.
Speaking of which, my DDs 2007 grey/blue Easton Synergy SCN1B 31" is still sitting in the garage after two years of her having moved up. Check the ebay prices and I'll ship you hers for a decent price. She currently swings a 2008 34" Phenix, which I can also recommend but they tend to go for over $350...
