COF-P Capital One Financial Preferred is paying just under 7%. Not callable until 2017 which is a positive. I would not pay more than $25.00
If you are not interested in buying single issues, you can also consider SPFF, a preferred ETF. You must be aware that this contains approx. 88% financials which can be considered risky. Buy a small, small position if you purchase SPFF. PFXF is another option that excludes financials but only pays 5.6%
If you have no experience in owning preferreds (or any other position mentioned here), you must conduct due diligence to understand the risks in owning this type of investment.