I have a question about balance transfers and paying off my debt. I currently have a few CCs (3-4, of which I only use 2 on a regular basis and one used because of the balance transfer offer). I have a Bank of America Better Balance Card (0% balance transfer rate until November 2014 and 21.99% after that), an American Express Gold card (17.24% APR) and a credit union card (10.99% APR). I currently have a balance on all three cards. I use the Bank of America card exclusively to pay off the existing balance with the goal of paying it off--but life got in the way and I had to put more money on the other cards for a rather expensive travel mistake that required me to buy a $1,500 plane ticket. So the Amex card has a balance of around $2,100, the credit union card $1,000 and the BoA card $1,400. I also get $25 taken away from my balance every quarter in which I pay more than the monthly minimum (which I do), giving me an extra savings of $100 a year, in addition to incentivizing paying more than the minimum.
Originally I planned to pay off the BoA balance before 0% balance transfer offer ended and not carry a balance on any of my cards, but that didn't happen and I now have a balance on every card. I am a bit more financially stable now, so I won't have to add more to those balances, but I know I won't be able to pay everything off by November. But now BoA is offering me another 0% balance transfer until December 2015, and I'm tempted to transfer as much of the Amex card balance as possible to the BoA card so I won't have to pay as much interest.
I'm concerned though that the new balance transfer will make it so that whatever I pay off on the BoA card will go towards the new balance and not towards the old balance. In other words, as of November 2014, I won't have paid off either balance transfer and I'll start accruing interest on the $1,400 I already owe on the card. Am I correct in this assumption? Would I be better off transferring the existing Amex balance to another, new card with a 0% balance transfer offer? I know Discover has one that's fairly attractive, but I don't know if this will be a good deal for me. I have fairly good credit (715 according to Creditkarma), but will opening another card set me back a lot? Likewise, will another balance transfer negatively affect my credit? Any advice would be greatly appreciated.
Originally I planned to pay off the BoA balance before 0% balance transfer offer ended and not carry a balance on any of my cards, but that didn't happen and I now have a balance on every card. I am a bit more financially stable now, so I won't have to add more to those balances, but I know I won't be able to pay everything off by November. But now BoA is offering me another 0% balance transfer until December 2015, and I'm tempted to transfer as much of the Amex card balance as possible to the BoA card so I won't have to pay as much interest.
I'm concerned though that the new balance transfer will make it so that whatever I pay off on the BoA card will go towards the new balance and not towards the old balance. In other words, as of November 2014, I won't have paid off either balance transfer and I'll start accruing interest on the $1,400 I already owe on the card. Am I correct in this assumption? Would I be better off transferring the existing Amex balance to another, new card with a 0% balance transfer offer? I know Discover has one that's fairly attractive, but I don't know if this will be a good deal for me. I have fairly good credit (715 according to Creditkarma), but will opening another card set me back a lot? Likewise, will another balance transfer negatively affect my credit? Any advice would be greatly appreciated.

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