NEW YORK (CNN/Money) - Sirius Satellite Radio is not ruling out a price increase for its basic subscription service in light of its arch rival's fee hike announced earlier this week, CEO Mel Karmazin told analysts Wednesday. Karmazin, who spoke at a Bear Stearns media conference in Florida, said XM Satellite Radio's announcement Monday that it would raise in early April its basic monthly subscription fee by 30 percent, to $12.95 a month, "opens up all kinds of options" for Sirius. Until now, Sirius (Research), while smaller than XM with just more than 1 million subscribers, has been the more...