One more stockwith some monster insider buying is satellite radio player Sirius XM Radio ( SIRI), which broadcasts its music, sports, entertainment, comedy, talk, news, traffic and weather channels in the U.S. on a subscription fee basis through its two satellite radio systems. Insiders are buying this stock into some decent strength here, since shares are up over 37% so far in 2012. Sirius XM Radio has a market cap of $9.64 billion and an enterprise value of $11.69 billion. This stock trades at reasonable valuation, with a trailing price-to-earnings of 4.66 and a forward price-to-earnings of 25.20. Its estimated growth rate for this year is 685%, and for next year it's pegged at -81.8%. This is not a cash-rich company, since the total cash position on its balance sheet is $868.33 million and its total debt is $2.88 billion. A beneficial owner just bought 89.97 million shares, or around $223.32 million worth of stock, at $2.45 per share.>>6 Sucker Stocks to Avoid at All Costs From a technical perspective, SIRI is currently trading above both its 50-day and 200-day moving averages, which is bullish. This stock recently triggered a major breakout, once it cleared $2.16 a share with monster upside volume flows. Following that breakout, shares of SIRI have soared and ran up to its recent high of $2.57 a share. That move has started to push SIRI into overbought territory, since its current relative strength index reading is now 72.45. This stock also just triggered another breakout above $$2.41 to $2.44 a share. If you're bullish on SIRI, then I would let this stock work off some of its overbought conditions before entering from the long side. Look to buy SIRI off any weakness as long as it doesn't trade back below $2.16 a share, or back below its 50-day and 200-day moving averages. That being said, I would consider any high-volume trend above $2.41 to $2.44 a share as bullish technical price action. I would consider any upside volume day that registers near or above its three-month average action of 52,897,500 shares as bullish. If SIRI can hold that trend after working off its overbought condition, then its stock should easily be on its way north of $3 a share. Again, I would only avoid this stock from the long side if it moves back below $2.16 or those key moving averages with heavy volume. To see more stocks with notable insider buying, including Facebook ( FB), Dole Food ( DOLE) and Pacific Biosciences of California ( PACB), check out the Stocks With Big Insider Buying portfolio on Stockpickr. -- Written by Roberto Pedone in Winderemere, Fla.