I have been researching a number of posts on flyertalk and other blogs regarding CCs and would like a suggestion on what I should do with my CCs selection and possibly getting another CC.

Airline and hotel preference:
Airline: I recently switched from UA to AA/US as a carrier due to where I fly each week. I have to charge all my flights through my corporate credit card. Personal flights obviously to my personal cards
Hotel preference: Marriott

Current Cards:
-AMEX Corporate Platinum - all business charges
-CITI AAdvantage executive - 100k mile bonus and lounge access
-CHASE Freedom - rarely use - oldest CC I have
-Retail credit credit card - for purchases only with that retail store and the daily discounts and decent reward points - 2nd oldest CC I have

I was considering applying for the Marriott Premier VISA (70K bonus) or Ink Bold card (bonus is about to end 6/1). Am a wrong with my selection. Also, should I consider cancelling one of my other credit cards?

Thank you for your advice.