None of your existing cards have 0% introductory offers? As quickly as you've added to your profile (and assuming some may not have even been reported to the credit bureaus yet), I would start being paranoid about AA from your existing lenders with adding any additional new accounts. Perhaps Citi DC has a balance transfer offer (you can usually deposit straight to checking)?
I'm thorn between stating the obvious and
What I would do would likely be different; we have very different credit profiles. If I were in your shoes, I would probably try to capitalize on a BT offer, though. 3% of $5000 is only $150. I would probably charge it to whatever earns me the most in rewards, and even if that is only 2% I'd look at it as getting a cheap loan for probably less than $50 net after the BT fee. Do you have any existing SUB spend that needs to be met? That alone would more than offset the fee on pretty much any card.
I wouldn't completely max out the Double Cash, though. How much can you afford to pay within 1 statement closing? Even if you only moved say $3800 to Double Cash with a 3% fee, that's the majority of it and would keep you under 80% with the BT fee.
