Seriously, I would have waited a bit before buying SIRI. The huge spike is due to the Mel announcement, but I expect we will see a large correction before it levels off for the long haul to Stern going live on sat radio. I'm probably going to buy some in the near future, but we still have over a year until Stern changes over, this is all on hype right now.
I'm not saying you will lose if you are long, but I always like to get the best price possible, and it is oversold right now.