Whoever you fly is up to you of course. But at the very least, sign up for both credit cards and for UA, toss in ameniti 2 year membership, upgrade your CC to gold immediately, if your limit can handle it write your self a $20K convienience check to earn for 10K miles, then do it again after the first of the year.

Also if you'll fly 12miles before before Dec 15, think about the Double EQM/EQS promo for $200 if it will get you 2P.