I found this game a few weeks ago called Escape Velocity Nova and OMGG its soooooo addictive!
*ambrosiasw.com*
the idea of it is u start as a wimpy traider, then after earning enough credits you buy up better and stronger ships... from there u can either take on the universe as a pirate plundering ships or u can take on the rebels or the aliens...
Or like me u can take on the role of a bounty hunter ; )
If your a star trek fan there are total conversions coming out turning entire game into a trek heaven!

well have a look, and give it a go!
Thanks