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Any idea what your scores look like?
What is your utilization on your current credit cards?
with your scores, i think you're good for any mid-range products out there: Discover, Chase freedom, some of Amex, Barclays, Citi, etc. I wouldn't apply for any secured stuff anymore, and wouldn't quite hit the top tier cards either. but in the middle there's plenty for you to pick from. LOTS OF CHOICES!
and if you care about credit limits, try to incease the CL of your cap1, and once it shows on your credit reports, then apply for others.