I'll agree with everyone else and add some references for your consideration.

It sounds like you're new to credit scoring, based on the question I quoted. Please consider carefully reading this primer on exactly what goes into a FICO score:

http://www.myfico.com/crediteducatio...yourscore.aspx

You'll notice a few things... Most importantly, this factor:

Every card stays on your report a minimum of 10 years. However, if you cancel every card after a year or two, you'll never have a credit report longer than 10-12 years.

Therefore, it is critical to keep one account open as long as possible, and preferably a few more just in case something happens to that oldest account. It's also a good idea to keep no-annual-fee accounts around anyway, as they will help balance out your average age of accounts, especially 10 years from now.

You should always charge something every 6 months to each card. So set up the less useful cards to autopay the full balance every month, then put something in your calendar every 5.5 months or so to remind you to have a day where you prepay some bills using those cards. Just $20 on each is enough.

Aside from all of this, it's anecdotally considered a good idea to keep one account open with each credit provider, to provide you a history with them in case you need a loan with them in the future.

Further, most of the cards you mentioned have some benefits you should consider using:

• Blue Cash AMEX - if you're close to a redemption threshold, might as well finish it - plus AMEX will use the age of your oldest account as the open date on new accounts you get
• Discover - great 5% quarterly bonuses lately
• Capital One cards have no foreign transaction fee
• Citi Dividend - could be canceled during a reconsideration call if you have trouble getting a Citi approval later

If you really wanted to "tidy up", I think canceling the newer CapOne card could make sense, since it doesn't really have many strong positives.