By Brandon Matthews
Despite Sirius XM Radio (Nasdaq: SIRI) turning in an impressive 2009 report card, there are still questions surrounding the company's debt -- especially debt that will be coming due in 2013, which Bank of America/Merrill Lynch (NYSE: BAC) deemed a "debt tower" in a recent bullish report. As we have discussed on Satwaves with nearly every analyst we've interviewed, a lack of any debt due in the current year, combined with an improved credit rating, provides Sirius XM with a...