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Congrats on the awesome limit. Do not consider it as free money, and always pay in full.
I would say keep the Capital one card also.
Congrats...treat her well and she'll take care of you. :-)
BTW...For what it's worth...you probably could've gotten approved for a Zync...there are plenty of people here who've gotten in with lower scores..
Keep the discover, close the CapOne. Then open a second credit card and one store card. You'll take a hit initially for the new accounts but in the end you'll be better off score wise. Three cards is IMHO the min for the best score and a store card will help the credit mix, also increasing score.
congrats on your new card! I can't wait until I'm on that level.