I just stopped doing curls and I never have a problem with them (forearms)anymore. I have been slacking on my chins lately, but my arms have gotten bigger even though I've abandonded "arms" day (which would routinely last for over an hour). This may not be the answer you are looking for, and I don't expect everyone to train solely for strength, but I know that it took awhile for me to convince myself I didn't need to do 12 sets of curls once a week because I was afraid of change, so I just wanted to present this rather extreme route.
Alwyn Cosgrove wrote a program about biceps training in around Oct.; I believe that it included no curls. This is probably something that will give you a few ideas. Good luck with your training.