Try anything Pureology or Aveda's Damage Therapy. Both lines are amazing for hair products overall and conditioning treatments.
Also, if you are using a straightener more than you used to, I would definitely recommend you pick up a pre-straightening cream to protect your locks. You basically run a dime sized amount through your hair, blow dry and then of course straighten it...without it the straightener essentially burns your hair resulting in more breakage and dryness. With a protective cream or spray, the heat burns through the product instead of your hair...ever notice at the hair salon when they straighten your hair, it almost steams?
Seriously, try it hun. Makes all the difference in the world and if you have fly away + frizzy hair, you'll find its not affected by humidity as much either....
Hope that helps somewhat.