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Depends on what your goal is are you looking to do more traveling or do you prefer cash back?
Are these cards that you absolutely NEED? Are you just trying to keep up with the Jonses on the forum? You have a solid collection of cards already that can do pretty much everything. Go over your credit needs and see if your spending can match what you're looking for. Don't just add cards to add cards. Ideally, it is good to have 3 cards for maximum scoring purposes. Any more than that is based strictly off your needs.
I think the AAoA argument of app sprees is a bit flawed. If you do the math starting from 0 and add one card every 6 months, the average age increases each time. Doing app sprees as a strategy is flawed but to each his own. Its just FUN!!! Its just my opinion but I want to have apps to look forward to not do them all at once and then never app again? Highly unlikely. Pick one card you REALLY want and get that and then take your time and figure out what else you want and get another one in 6 months. Taking your time you may find you really don't want anything else and then you're not on here asking us what you should close. The above poster JonE was right, you already have a nice line up of cards. You don't need a lot. But who am I to tell you what you need. I just think a long term strategy should be just that. Long term. Sorry if I rained on your parade.
Did you go on your spree yet?
I think the Thank You Premier or Prestiage cards are great but like I said it depends on what you want to do.
I like to travel so travel cards are important to me to happy get free or cheap tickets and hotels and travel in comfort.
What do you think about the Premier and Prestiage