After the Houston Astros traded Roy Oswalt last summer, there has been a glaring need for a true ace, someone who can anchor the top of the rotation and set an example for the rest of the pitchers. Brett Myers pitched well down the stretch for them last year but does not have the talent to be that true ace the Astros need.

Cliff Lee is a great example of the difference a true ace can have on a team. The Texas Rangers played very well after they traded with Seattle for Lee. He set a great example for the rest of the young pitchers like CJ Wilson and Tommy Hunter. The Astros need this kind of leadership with young pitchers like J.A. Happ and Bud Norris being relied on to play key roles this year. 

Here are 10 trade ideas that would allow the Astros to acquire that top-of-the-line pitcher. Some of these pitchers may not be considered true aces right now but have the potential to become that true ace.

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