Are you limiting yourself to one card?

How many miles do you have in your AAdvantage account? Since you're Miami-based, you may want to consider getting all three Citi AA cards and meet the spending minimums ($1500 + $4000 + $1500) to receive 232K miles, which will also count towards your million mile status through December 1st, when this finally ends.

I would then sign up for the Marriott card to take advantage of the 5 point per dollar on the remaining $43,000 you have to spend (if Chase will give you a limit that high). In the end, you would have a combined 500,000+ air and hotel points.