You can have multiple cards with Capital One. YMMV, but from what I have seen on the boards you dont have the option to combine your secured card with your quicksilver. I have read that many people have been stuck with their secured cards and Cap One will not graduate them, but again YMMV. Good luck.
Give em a call and see if they will mature/upgrade it for you to an unsecured? I have a couple Cap1 cards and theya re very easy to manage form single login etc