I have both a secured and unsecured Capital One account, both opened in June 2012. I started with a score of 523 and now I'm at 643. Not sure who stated that you can't have a secured and unsecured card with Captial One. Stay clear away from major banks such as BOA and Citibank until you deal with the baddies on your credit report. I am just allowing time to heal my scores since I am recovering from bankruptcy and waited a year to start rebuilding.
Utlization is VERY important. Keep it under 10%. I do 7% since myfico.com stated high achieves keep utilization at 7% and my score starting shooting up. The suggested 30% was not working for me. My score either would drop or not move, and paying in full would cause it to drop 5 points
I love my secured card, my plan is to use it for 11 months and cancel! It served its purpose and since it doesn't convert to unsecured, and If I continue on this path I will be over 700 in no time and would qualify for better cards.