Hey PoorGrad!
The first thing I would ask is your level of concern on impact on your FICO score. Ignoring FICO impact, you clearly go with the best deal on overall interest over the period of the advance.
However, considering FICO impact, keep it to the lowest effect on your %util of the account from which you secure the $5000.
A strict BT does not usually allow you to use the money to pay directly back to the account from which transferred. . But most now offer you convenience checks which can be deposited directly into your checking account, and thus free to use any way you choose. Check out the options.
Financial planning must be balanced against FICO planning. They are different. If you dont need new credit in the immediate future, your plan is clear. If, however, you will be seeking additional new credit in the immediate future, then you must put FICO impact into the equation, with the major consideration your %util on the accounts.