If you're using heat on your hair then you need to use a heat protector before blowdrying. I'm using
Dove Heat Activated Protect & Shine Mist http://www.theshadesofu.com/2009/05/dove-heat-defense-therapy-series-heat.html but i've found most heat defence products work just as well. Conditioning isn't enough if you're using a hairdryer every time you wash your hair. I use a serum before hairspray as well and my hair keeps in pretty decent condition.