you have an amex gold right? if so you may want to consider appng the blue in jan, for a couple of reasons.
1. you will get the max amount of history for the new account. (amex gives history from the month the new account is opened and the year of the first account relationship, ie cardholder since '95, new app in '09 would get history reported as 1/95 vs 7/95 if you appd today).
2. your new accounts would be at least 6 months old and already gaining points back from the new account hit.
3. i think the rewards structure goes by calender year so pushing over 6.5k in the last 5 months wouldn't get you the most out of it (at least not w/o great effort maybe?)
however, i think my aa had something to do with the fact that i live in a state that has a high mort default rate and the number of new accounts (31 in the last year, but this includes several car refi's and flushing and replacing just about every cc i had).
just some thoughts.
