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Here's a link to a thread that has the T&C's for the different levels of cards with Capital One, including how many of each type you can (generally) have:
http://ficoforums.myfico.com/t5/Credit-Cards/Maximum-Number-of-Cap-One-Cards-A-Guide/td-p/4368334
There will be folks who these rules will seem to not apply, just as occasionally you see somebody on here with a Venture MasterCard or a Quicksilver MasterCard (not QS1) - there are always outliers and exceptions - but for people applying fresh the "rules" listed should be a good guide.