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Why do you want to play with Cap1 still? Keep your BB&T cards and let your file age a year or so to get the most out of it.
@Anonymous, if I may suggest looking at credit unions to diversify your CC portfolio mix, that's another viable option as well. I wouldn't worry about the BB&T and SunTrust merger as something that would place your profile on the radar in a negative way.
You can apply right away assuming the card you closed was more than 6 months old.
Did you already close the cap1 account? You can apply for another cap1 card before you close it, if you want. Check their pre-qual page to see if they're already offering anything to you.
I'd just keep it open, and try for the new card after you hit 6 months, then close the first card after that if you still desire.