Type that: (I have extra invisible formatting characters that are blocking it from being accepted as a link, those are the exact string you want).
[L=My rig]http://www.anandtech.com/mysystemrig.html?id=14205[/L]
And the text will say My Rig, and link to the part between the L's.
You can change the display text to anything you want, just put it between the = and the ].